// VERY IMPORTANT !!!
//
// THIS CODE WILL BE INSERTED IN THE STACK BEFORE EVERYTHING ELSE
// IN PARTICULAR IT MEANS YOU CAN NOT USE ANY PROTOTYPE.JS IN HERE
//


if (typeof MMT != "undefined") {
 alert("Namespace conflict. MMT must not be set at that point");
}

MMT = {};
document.MMT = MMT;

if ((typeof console !== "undefined") && console.log) {
  MMT.log = function(x) { console.log(x) };
} else {
  MMT.log = function() {};
}


// 

// singleton mix-in

MMT.addSingletonMixin = function(targetClass)
{
  
  Object.extend(targetClass, {
	
  	defaultInstance: function()  // Class Method
  	{
  		if (targetClass._defaultInstance) return targetClass._defaultInstance; 
  		targetClass._defaultInstance = new targetClass();
  		return targetClass._defaultInstance;
	
  	}, 
	
  	// Private class var
  	_defaultInstance: null
  });
}





/*  Prototype JavaScript framework, version 1.6.0.2
 *  (c) 2005-2008 Sam Stephenson
 *
 *  Prototype is freely distributable under the terms of an MIT-style license.
 *  For details, see the Prototype web site: http://www.prototypejs.org/
 *
 *--------------------------------------------------------------------------*/

var Prototype = {
  Version: '1.6.0.2',

  Browser: {
    IE:     !!(window.attachEvent && !window.opera),
    Opera:  !!window.opera,
    WebKit: navigator.userAgent.indexOf('AppleWebKit/') > -1,
    Gecko:  navigator.userAgent.indexOf('Gecko') > -1 && navigator.userAgent.indexOf('KHTML') == -1,
    MobileSafari: !!navigator.userAgent.match(/Apple.*Mobile.*Safari/)
  },

  BrowserFeatures: {
    XPath: !!document.evaluate,
    ElementExtensions: !!window.HTMLElement,
    SpecificElementExtensions:
      document.createElement('div').__proto__ &&
      document.createElement('div').__proto__ !==
        document.createElement('form').__proto__
  },

  ScriptFragment: '<script[^>]*>([\\S\\s]*?)<\/script>',
  JSONFilter: /^\/\*-secure-([\s\S]*)\*\/\s*$/,

  emptyFunction: function() { },
  K: function(x) { return x }
};

if (Prototype.Browser.MobileSafari)
  Prototype.BrowserFeatures.SpecificElementExtensions = false;


/* Based on Alex Arnell's inheritance implementation. */
var Class = {
  create: function() {
    var parent = null, properties = $A(arguments);
    if (Object.isFunction(properties[0]))
      parent = properties.shift();

    function klass() {
      this.initialize.apply(this, arguments);
    }

    Object.extend(klass, Class.Methods);
    klass.superclass = parent;
    klass.subclasses = [];

    if (parent) {
      var subclass = function() { };
      subclass.prototype = parent.prototype;
      klass.prototype = new subclass;
      parent.subclasses.push(klass);
    }

    for (var i = 0; i < properties.length; i++)
      klass.addMethods(properties[i]);

    if (!klass.prototype.initialize)
      klass.prototype.initialize = Prototype.emptyFunction;

    klass.prototype.constructor = klass;

    return klass;
  }
};

Class.Methods = {
  addMethods: function(source) {
    var ancestor   = this.superclass && this.superclass.prototype;
    var properties = Object.keys(source);

    if (!Object.keys({ toString: true }).length)
      properties.push("toString", "valueOf");

    for (var i = 0, length = properties.length; i < length; i++) {
      var property = properties[i], value = source[property];
      if (ancestor && Object.isFunction(value) &&
          value.argumentNames().first() == "$super") {
        var method = value, value = Object.extend((function(m) {
          return function() { return ancestor[m].apply(this, arguments) };
        })(property).wrap(method), {
          valueOf:  function() { return method },
          toString: function() { return method.toString() }
        });
      }
      this.prototype[property] = value;
    }

    return this;
  }
};

var Abstract = { };

Object.extend = function(destination, source) {
  for (var property in source)
    destination[property] = source[property];
  return destination;
};

Object.extend(Object, {
  inspect: function(object) {
    try {
      if (Object.isUndefined(object)) return 'undefined';
      if (object === null) return 'null';
      return object.inspect ? object.inspect() : String(object);
    } catch (e) {
      if (e instanceof RangeError) return '...';
      throw e;
    }
  },

  toJSON: function(object) {
    var type = typeof object;
    switch (type) {
      case 'undefined':
      case 'function':
      case 'unknown': return;
      case 'boolean': return object.toString();
    }

    if (object === null) return 'null';
    if (object.toJSON) return object.toJSON();
    if (Object.isElement(object)) return;

    var results = [];
    for (var property in object) {
      var value = Object.toJSON(object[property]);
      if (!Object.isUndefined(value))
        results.push(property.toJSON() + ': ' + value);
    }

    return '{' + results.join(', ') + '}';
  },

  toQueryString: function(object) {
    return $H(object).toQueryString();
  },

  toHTML: function(object) {
    return object && object.toHTML ? object.toHTML() : String.interpret(object);
  },

  keys: function(object) {
    var keys = [];
    for (var property in object)
      keys.push(property);
    return keys;
  },

  values: function(object) {
    var values = [];
    for (var property in object)
      values.push(object[property]);
    return values;
  },

  clone: function(object) {
    return Object.extend({ }, object);
  },

  isElement: function(object) {
    return object && object.nodeType == 1;
  },

  isArray: function(object) {
    return object != null && typeof object == "object" &&
      'splice' in object && 'join' in object;
  },

  isHash: function(object) {
    return object instanceof Hash;
  },

  isFunction: function(object) {
    return typeof object == "function";
  },

  isString: function(object) {
    return typeof object == "string";
  },

  isNumber: function(object) {
    return typeof object == "number";
  },

  isUndefined: function(object) {
    return typeof object == "undefined";
  }
});

Object.extend(Function.prototype, {
  argumentNames: function() {
    var names = this.toString().match(/^[\s\(]*function[^(]*\((.*?)\)/)[1].split(",").invoke("strip");
    return names.length == 1 && !names[0] ? [] : names;
  },

  bind: function() {
    if (arguments.length < 2 && Object.isUndefined(arguments[0])) return this;
    var __method = this, args = $A(arguments), object = args.shift();
    return function() {
      return __method.apply(object, args.concat($A(arguments)));
    }
  },

  bindAsEventListener: function() {
    var __method = this, args = $A(arguments), object = args.shift();
    return function(event) {
      return __method.apply(object, [event || window.event].concat(args));
    }
  },

  curry: function() {
    if (!arguments.length) return this;
    var __method = this, args = $A(arguments);
    return function() {
      return __method.apply(this, args.concat($A(arguments)));
    }
  },

  delay: function() {
    var __method = this, args = $A(arguments), timeout = args.shift() * 1000;
    return window.setTimeout(function() {
      return __method.apply(__method, args);
    }, timeout);
  },

  wrap: function(wrapper) {
    var __method = this;
    return function() {
      return wrapper.apply(this, [__method.bind(this)].concat($A(arguments)));
    }
  },

  methodize: function() {
    if (this._methodized) return this._methodized;
    var __method = this;
    return this._methodized = function() {
      return __method.apply(null, [this].concat($A(arguments)));
    };
  }
});

Function.prototype.defer = Function.prototype.delay.curry(0.01);

Date.prototype.toJSON = function() {
  return '"' + this.getUTCFullYear() + '-' +
    (this.getUTCMonth() + 1).toPaddedString(2) + '-' +
    this.getUTCDate().toPaddedString(2) + 'T' +
    this.getUTCHours().toPaddedString(2) + ':' +
    this.getUTCMinutes().toPaddedString(2) + ':' +
    this.getUTCSeconds().toPaddedString(2) + 'Z"';
};

var Try = {
  these: function() {
    var returnValue;

    for (var i = 0, length = arguments.length; i < length; i++) {
      var lambda = arguments[i];
      try {
        returnValue = lambda();
        break;
      } catch (e) { }
    }

    return returnValue;
  }
};

RegExp.prototype.match = RegExp.prototype.test;

RegExp.escape = function(str) {
  return String(str).replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1');
};

/*--------------------------------------------------------------------------*/

var PeriodicalExecuter = Class.create({
  initialize: function(callback, frequency) {
    this.callback = callback;
    this.frequency = frequency;
    this.currentlyExecuting = false;

    this.registerCallback();
  },

  registerCallback: function() {
    this.timer = setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
  },

  execute: function() {
    this.callback(this);
  },

  stop: function() {
    if (!this.timer) return;
    clearInterval(this.timer);
    this.timer = null;
  },

  onTimerEvent: function() {
    if (!this.currentlyExecuting) {
      try {
        this.currentlyExecuting = true;
        this.execute();
      } finally {
        this.currentlyExecuting = false;
      }
    }
  }
});
Object.extend(String, {
  interpret: function(value) {
    return value == null ? '' : String(value);
  },
  specialChar: {
    '\b': '\\b',
    '\t': '\\t',
    '\n': '\\n',
    '\f': '\\f',
    '\r': '\\r',
    '\\': '\\\\'
  }
});

Object.extend(String.prototype, {
  gsub: function(pattern, replacement) {
    var result = '', source = this, match;
    replacement = arguments.callee.prepareReplacement(replacement);

    while (source.length > 0) {
      if (match = source.match(pattern)) {
        result += source.slice(0, match.index);
        result += String.interpret(replacement(match));
        source  = source.slice(match.index + match[0].length);
      } else {
        result += source, source = '';
      }
    }
    return result;
  },

  sub: function(pattern, replacement, count) {
    replacement = this.gsub.prepareReplacement(replacement);
    count = Object.isUndefined(count) ? 1 : count;

    return this.gsub(pattern, function(match) {
      if (--count < 0) return match[0];
      return replacement(match);
    });
  },

  scan: function(pattern, iterator) {
    this.gsub(pattern, iterator);
    return String(this);
  },

  truncate: function(length, truncation) {
    length = length || 30;
    truncation = Object.isUndefined(truncation) ? '...' : truncation;
    return this.length > length ?
      this.slice(0, length - truncation.length) + truncation : String(this);
  },

  strip: function() {
    return this.replace(/^\s+/, '').replace(/\s+$/, '');
  },

  stripTags: function() {
    return this.replace(/<\/?[^>]+>/gi, '');
  },

  stripScripts: function() {
    return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
  },

  extractScripts: function() {
    var matchAll = new RegExp(Prototype.ScriptFragment, 'img');
    var matchOne = new RegExp(Prototype.ScriptFragment, 'im');
    return (this.match(matchAll) || []).map(function(scriptTag) {
      return (scriptTag.match(matchOne) || ['', ''])[1];
    });
  },

  evalScripts: function() {
    return this.extractScripts().map(function(script) { return eval(script) });
  },

  escapeHTML: function() {
    var self = arguments.callee;
    self.text.data = this;
    return self.div.innerHTML;
  },

  unescapeHTML: function() {
    var div = new Element('div');
    div.innerHTML = this.stripTags();
    return div.childNodes[0] ? (div.childNodes.length > 1 ?
      $A(div.childNodes).inject('', function(memo, node) { return memo+node.nodeValue }) :
      div.childNodes[0].nodeValue) : '';
  },

  toQueryParams: function(separator) {
    var match = this.strip().match(/([^?#]*)(#.*)?$/);
    if (!match) return { };

    return match[1].split(separator || '&').inject({ }, function(hash, pair) {
      if ((pair = pair.split('='))[0]) {
        var key = decodeURIComponent(pair.shift());
        var value = pair.length > 1 ? pair.join('=') : pair[0];
        if (value != undefined) value = decodeURIComponent(value);

        if (key in hash) {
          if (!Object.isArray(hash[key])) hash[key] = [hash[key]];
          hash[key].push(value);
        }
        else hash[key] = value;
      }
      return hash;
    });
  },

  toArray: function() {
    return this.split('');
  },

  succ: function() {
    return this.slice(0, this.length - 1) +
      String.fromCharCode(this.charCodeAt(this.length - 1) + 1);
  },

  times: function(count) {
    return count < 1 ? '' : new Array(count + 1).join(this);
  },

  camelize: function() {
    var parts = this.split('-'), len = parts.length;
    if (len == 1) return parts[0];

    var camelized = this.charAt(0) == '-'
      ? parts[0].charAt(0).toUpperCase() + parts[0].substring(1)
      : parts[0];

    for (var i = 1; i < len; i++)
      camelized += parts[i].charAt(0).toUpperCase() + parts[i].substring(1);

    return camelized;
  },

  capitalize: function() {
    return this.charAt(0).toUpperCase() + this.substring(1).toLowerCase();
  },

  underscore: function() {
    return this.gsub(/::/, '/').gsub(/([A-Z]+)([A-Z][a-z])/,'#{1}_#{2}').gsub(/([a-z\d])([A-Z])/,'#{1}_#{2}').gsub(/-/,'_').toLowerCase();
  },

  dasherize: function() {
    return this.gsub(/_/,'-');
  },

  inspect: function(useDoubleQuotes) {
    var escapedString = this.gsub(/[\x00-\x1f\\]/, function(match) {
      var character = String.specialChar[match[0]];
      return character ? character : '\\u00' + match[0].charCodeAt().toPaddedString(2, 16);
    });
    if (useDoubleQuotes) return '"' + escapedString.replace(/"/g, '\\"') + '"';
    return "'" + escapedString.replace(/'/g, '\\\'') + "'";
  },

  toJSON: function() {
    return this.inspect(true);
  },

  unfilterJSON: function(filter) {
    return this.sub(filter || Prototype.JSONFilter, '#{1}');
  },

  isJSON: function() {
    var str = this;
    if (str.blank()) return false;
    str = this.replace(/\\./g, '@').replace(/"[^"\\\n\r]*"/g, '');
    return (/^[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]*$/).test(str);
  },

  evalJSON: function(sanitize) {
    var json = this.unfilterJSON();
    try {
      if (!sanitize || json.isJSON()) return eval('(' + json + ')');
    } catch (e) { }
    throw new SyntaxError('Badly formed JSON string: ' + this.inspect());
  },

  include: function(pattern) {
    return this.indexOf(pattern) > -1;
  },

  startsWith: function(pattern) {
    return this.indexOf(pattern) === 0;
  },

  endsWith: function(pattern) {
    var d = this.length - pattern.length;
    return d >= 0 && this.lastIndexOf(pattern) === d;
  },

  empty: function() {
    return this == '';
  },

  blank: function() {
    return /^\s*$/.test(this);
  },

  interpolate: function(object, pattern) {
    return new Template(this, pattern).evaluate(object);
  }
});

if (Prototype.Browser.WebKit || Prototype.Browser.IE) Object.extend(String.prototype, {
  escapeHTML: function() {
    return this.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
  },
  unescapeHTML: function() {
    return this.replace(/&amp;/g,'&').replace(/&lt;/g,'<').replace(/&gt;/g,'>');
  }
});

String.prototype.gsub.prepareReplacement = function(replacement) {
  if (Object.isFunction(replacement)) return replacement;
  var template = new Template(replacement);
  return function(match) { return template.evaluate(match) };
};

String.prototype.parseQuery = String.prototype.toQueryParams;

Object.extend(String.prototype.escapeHTML, {
  div:  document.createElement('div'),
  text: document.createTextNode('')
});

with (String.prototype.escapeHTML) div.appendChild(text);

var Template = Class.create({
  initialize: function(template, pattern) {
    this.template = template.toString();
    this.pattern = pattern || Template.Pattern;
  },

  evaluate: function(object) {
    if (Object.isFunction(object.toTemplateReplacements))
      object = object.toTemplateReplacements();

    return this.template.gsub(this.pattern, function(match) {
      if (object == null) return '';

      var before = match[1] || '';
      if (before == '\\') return match[2];

      var ctx = object, expr = match[3];
      var pattern = /^([^.[]+|\[((?:.*?[^\\])?)\])(\.|\[|$)/;
      match = pattern.exec(expr);
      if (match == null) return before;

      while (match != null) {
        var comp = match[1].startsWith('[') ? match[2].gsub('\\\\]', ']') : match[1];
        ctx = ctx[comp];
        if (null == ctx || '' == match[3]) break;
        expr = expr.substring('[' == match[3] ? match[1].length : match[0].length);
        match = pattern.exec(expr);
      }

      return before + String.interpret(ctx);
    });
  }
});
Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;

var $break = { };

var Enumerable = {
  each: function(iterator, context) {
    var index = 0;
    iterator = iterator.bind(context);
    try {
      this._each(function(value) {
        iterator(value, index++);
      });
    } catch (e) {
      if (e != $break) throw e;
    }
    return this;
  },

  eachSlice: function(number, iterator, context) {
    iterator = iterator ? iterator.bind(context) : Prototype.K;
    var index = -number, slices = [], array = this.toArray();
    while ((index += number) < array.length)
      slices.push(array.slice(index, index+number));
    return slices.collect(iterator, context);
  },

  all: function(iterator, context) {
    iterator = iterator ? iterator.bind(context) : Prototype.K;
    var result = true;
    this.each(function(value, index) {
      result = result && !!iterator(value, index);
      if (!result) throw $break;
    });
    return result;
  },

  any: function(iterator, context) {
    iterator = iterator ? iterator.bind(context) : Prototype.K;
    var result = false;
    this.each(function(value, index) {
      if (result = !!iterator(value, index))
        throw $break;
    });
    return result;
  },

  collect: function(iterator, context) {
    iterator = iterator ? iterator.bind(context) : Prototype.K;
    var results = [];
    this.each(function(value, index) {
      results.push(iterator(value, index));
    });
    return results;
  },

  detect: function(iterator, context) {
    iterator = iterator.bind(context);
    var result;
    this.each(function(value, index) {
      if (iterator(value, index)) {
        result = value;
        throw $break;
      }
    });
    return result;
  },

  findAll: function(iterator, context) {
    iterator = iterator.bind(context);
    var results = [];
    this.each(function(value, index) {
      if (iterator(value, index))
        results.push(value);
    });
    return results;
  },

  grep: function(filter, iterator, context) {
    iterator = iterator ? iterator.bind(context) : Prototype.K;
    var results = [];

    if (Object.isString(filter))
      filter = new RegExp(filter);

    this.each(function(value, index) {
      if (filter.match(value))
        results.push(iterator(value, index));
    });
    return results;
  },

  include: function(object) {
    if (Object.isFunction(this.indexOf))
      if (this.indexOf(object) != -1) return true;

    var found = false;
    this.each(function(value) {
      if (value == object) {
        found = true;
        throw $break;
      }
    });
    return found;
  },

  inGroupsOf: function(number, fillWith) {
    fillWith = Object.isUndefined(fillWith) ? null : fillWith;
    return this.eachSlice(number, function(slice) {
      while(slice.length < number) slice.push(fillWith);
      return slice;
    });
  },

  inject: function(memo, iterator, context) {
    iterator = iterator.bind(context);
    this.each(function(value, index) {
      memo = iterator(memo, value, index);
    });
    return memo;
  },

  invoke: function(method) {
    var args = $A(arguments).slice(1);
    return this.map(function(value) {
      return value[method].apply(value, args);
    });
  },

  max: function(iterator, context) {
    iterator = iterator ? iterator.bind(context) : Prototype.K;
    var result;
    this.each(function(value, index) {
      value = iterator(value, index);
      if (result == null || value >= result)
        result = value;
    });
    return result;
  },

  min: function(iterator, context) {
    iterator = iterator ? iterator.bind(context) : Prototype.K;
    var result;
    this.each(function(value, index) {
      value = iterator(value, index);
      if (result == null || value < result)
        result = value;
    });
    return result;
  },

  partition: function(iterator, context) {
    iterator = iterator ? iterator.bind(context) : Prototype.K;
    var trues = [], falses = [];
    this.each(function(value, index) {
      (iterator(value, index) ?
        trues : falses).push(value);
    });
    return [trues, falses];
  },

  pluck: function(property) {
    var results = [];
    this.each(function(value) {
      results.push(value[property]);
    });
    return results;
  },

  reject: function(iterator, context) {
    iterator = iterator.bind(context);
    var results = [];
    this.each(function(value, index) {
      if (!iterator(value, index))
        results.push(value);
    });
    return results;
  },

  sortBy: function(iterator, context) {
    iterator = iterator.bind(context);
    return this.map(function(value, index) {
      return {value: value, criteria: iterator(value, index)};
    }).sort(function(left, right) {
      var a = left.criteria, b = right.criteria;
      return a < b ? -1 : a > b ? 1 : 0;
    }).pluck('value');
  },

  toArray: function() {
    return this.map();
  },

  zip: function() {
    var iterator = Prototype.K, args = $A(arguments);
    if (Object.isFunction(args.last()))
      iterator = args.pop();

    var collections = [this].concat(args).map($A);
    return this.map(function(value, index) {
      return iterator(collections.pluck(index));
    });
  },

  size: function() {
    return this.toArray().length;
  },

  inspect: function() {
    return '#<Enumerable:' + this.toArray().inspect() + '>';
  }
};

Object.extend(Enumerable, {
  map:     Enumerable.collect,
  find:    Enumerable.detect,
  select:  Enumerable.findAll,
  filter:  Enumerable.findAll,
  member:  Enumerable.include,
  entries: Enumerable.toArray,
  every:   Enumerable.all,
  some:    Enumerable.any
});
function $A(iterable) {
  if (!iterable) return [];
  if (iterable.toArray) return iterable.toArray();
  var length = iterable.length || 0, results = new Array(length);
  while (length--) results[length] = iterable[length];
  return results;
}

if (Prototype.Browser.WebKit) {
  $A = function(iterable) {
    if (!iterable) return [];
    if (!(Object.isFunction(iterable) && iterable == '[object NodeList]') &&
        iterable.toArray) return iterable.toArray();
    var length = iterable.length || 0, results = new Array(length);
    while (length--) results[length] = iterable[length];
    return results;
  };
}

Array.from = $A;

Object.extend(Array.prototype, Enumerable);

if (!Array.prototype._reverse) Array.prototype._reverse = Array.prototype.reverse;

Object.extend(Array.prototype, {
  _each: function(iterator) {
    for (var i = 0, length = this.length; i < length; i++)
      iterator(this[i]);
  },

  clear: function() {
    this.length = 0;
    return this;
  },

  first: function() {
    return this[0];
  },

  last: function() {
    return this[this.length - 1];
  },

  compact: function() {
    return this.select(function(value) {
      return value != null;
    });
  },

  flatten: function() {
    return this.inject([], function(array, value) {
      return array.concat(Object.isArray(value) ?
        value.flatten() : [value]);
    });
  },

  without: function() {
    var values = $A(arguments);
    return this.select(function(value) {
      return !values.include(value);
    });
  },

  reverse: function(inline) {
    return (inline !== false ? this : this.toArray())._reverse();
  },

  reduce: function() {
    return this.length > 1 ? this : this[0];
  },

  uniq: function(sorted) {
    return this.inject([], function(array, value, index) {
      if (0 == index || (sorted ? array.last() != value : !array.include(value)))
        array.push(value);
      return array;
    });
  },

  intersect: function(array) {
    return this.uniq().findAll(function(item) {
      return array.detect(function(value) { return item === value });
    });
  },

  clone: function() {
    return [].concat(this);
  },

  size: function() {
    return this.length;
  },

  inspect: function() {
    return '[' + this.map(Object.inspect).join(', ') + ']';
  },

  toJSON: function() {
    var results = [];
    this.each(function(object) {
      var value = Object.toJSON(object);
      if (!Object.isUndefined(value)) results.push(value);
    });
    return '[' + results.join(', ') + ']';
  }
});

// use native browser JS 1.6 implementation if available
if (Object.isFunction(Array.prototype.forEach))
  Array.prototype._each = Array.prototype.forEach;

if (!Array.prototype.indexOf) Array.prototype.indexOf = function(item, i) {
  i || (i = 0);
  var length = this.length;
  if (i < 0) i = length + i;
  for (; i < length; i++)
    if (this[i] === item) return i;
  return -1;
};

if (!Array.prototype.lastIndexOf) Array.prototype.lastIndexOf = function(item, i) {
  i = isNaN(i) ? this.length : (i < 0 ? this.length + i : i) + 1;
  var n = this.slice(0, i).reverse().indexOf(item);
  return (n < 0) ? n : i - n - 1;
};

Array.prototype.toArray = Array.prototype.clone;

function $w(string) {
  if (!Object.isString(string)) return [];
  string = string.strip();
  return string ? string.split(/\s+/) : [];
}

if (Prototype.Browser.Opera){
  Array.prototype.concat = function() {
    var array = [];
    for (var i = 0, length = this.length; i < length; i++) array.push(this[i]);
    for (var i = 0, length = arguments.length; i < length; i++) {
      if (Object.isArray(arguments[i])) {
        for (var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)
          array.push(arguments[i][j]);
      } else {
        array.push(arguments[i]);
      }
    }
    return array;
  };
}
Object.extend(Number.prototype, {
  toColorPart: function() {
    return this.toPaddedString(2, 16);
  },

  succ: function() {
    return this + 1;
  },

  times: function(iterator) {
    $R(0, this, true).each(iterator);
    return this;
  },

  toPaddedString: function(length, radix) {
    var string = this.toString(radix || 10);
    return '0'.times(length - string.length) + string;
  },

  toJSON: function() {
    return isFinite(this) ? this.toString() : 'null';
  }
});

$w('abs round ceil floor').each(function(method){
  Number.prototype[method] = Math[method].methodize();
});
function $H(object) {
  return new Hash(object);
};

var Hash = Class.create(Enumerable, (function() {

  function toQueryPair(key, value) {
    if (Object.isUndefined(value)) return key;
    return key + '=' + encodeURIComponent(String.interpret(value));
  }

  return {
    initialize: function(object) {
      this._object = Object.isHash(object) ? object.toObject() : Object.clone(object);
    },

    _each: function(iterator) {
      for (var key in this._object) {
        var value = this._object[key], pair = [key, value];
        pair.key = key;
        pair.value = value;
        iterator(pair);
      }
    },

    set: function(key, value) {
      return this._object[key] = value;
    },

    get: function(key) {
      return this._object[key];
    },

    unset: function(key) {
      var value = this._object[key];
      delete this._object[key];
      return value;
    },

    toObject: function() {
      return Object.clone(this._object);
    },

    keys: function() {
      return this.pluck('key');
    },

    values: function() {
      return this.pluck('value');
    },

    index: function(value) {
      var match = this.detect(function(pair) {
        return pair.value === value;
      });
      return match && match.key;
    },

    merge: function(object) {
      return this.clone().update(object);
    },

    update: function(object) {
      return new Hash(object).inject(this, function(result, pair) {
        result.set(pair.key, pair.value);
        return result;
      });
    },

    toQueryString: function() {
      return this.map(function(pair) {
        var key = encodeURIComponent(pair.key), values = pair.value;

        if (values && typeof values == 'object') {
          if (Object.isArray(values))
            return values.map(toQueryPair.curry(key)).join('&');
        }
        return toQueryPair(key, values);
      }).join('&');
    },

    inspect: function() {
      return '#<Hash:{' + this.map(function(pair) {
        return pair.map(Object.inspect).join(': ');
      }).join(', ') + '}>';
    },

    toJSON: function() {
      return Object.toJSON(this.toObject());
    },

    clone: function() {
      return new Hash(this);
    }
  }
})());

Hash.prototype.toTemplateReplacements = Hash.prototype.toObject;
Hash.from = $H;
var ObjectRange = Class.create(Enumerable, {
  initialize: function(start, end, exclusive) {
    this.start = start;
    this.end = end;
    this.exclusive = exclusive;
  },

  _each: function(iterator) {
    var value = this.start;
    while (this.include(value)) {
      iterator(value);
      value = value.succ();
    }
  },

  include: function(value) {
    if (value < this.start)
      return false;
    if (this.exclusive)
      return value < this.end;
    return value <= this.end;
  }
});

var $R = function(start, end, exclusive) {
  return new ObjectRange(start, end, exclusive);
};

var Ajax = {
  getTransport: function() {
    return Try.these(
      function() {return new XMLHttpRequest()},
      function() {return new ActiveXObject('Msxml2.XMLHTTP')},
      function() {return new ActiveXObject('Microsoft.XMLHTTP')}
    ) || false;
  },

  activeRequestCount: 0
};

Ajax.Responders = {
  responders: [],

  _each: function(iterator) {
    this.responders._each(iterator);
  },

  register: function(responder) {
    if (!this.include(responder))
      this.responders.push(responder);
  },

  unregister: function(responder) {
    this.responders = this.responders.without(responder);
  },

  dispatch: function(callback, request, transport, json) {
    this.each(function(responder) {
      if (Object.isFunction(responder[callback])) {
        try {
          responder[callback].apply(responder, [request, transport, json]);
        } catch (e) { }
      }
    });
  }
};

Object.extend(Ajax.Responders, Enumerable);

Ajax.Responders.register({
  onCreate:   function() { Ajax.activeRequestCount++ },
  onComplete: function() { Ajax.activeRequestCount-- }
});

Ajax.Base = Class.create({
  initialize: function(options) {
    this.options = {
      method:       'post',
      asynchronous: true,
      contentType:  'application/x-www-form-urlencoded',
      encoding:     'UTF-8',
      parameters:   '',
      evalJSON:     true,
      evalJS:       true
    };
    Object.extend(this.options, options || { });

    this.options.method = this.options.method.toLowerCase();

    if (Object.isString(this.options.parameters))
      this.options.parameters = this.options.parameters.toQueryParams();
    else if (Object.isHash(this.options.parameters))
      this.options.parameters = this.options.parameters.toObject();
  }
});

Ajax.Request = Class.create(Ajax.Base, {
  _complete: false,

  initialize: function($super, url, options) {
    $super(options);
    this.transport = Ajax.getTransport();
    this.request(url);
  },

  request: function(url) {
    this.url = url;
    this.method = this.options.method;
    var params = Object.clone(this.options.parameters);

    if (!['get', 'post'].include(this.method)) {
      // simulate other verbs over post
      params['_method'] = this.method;
      this.method = 'post';
    }

    this.parameters = params;

    if (params = Object.toQueryString(params)) {
      // when GET, append parameters to URL
      if (this.method == 'get')
        this.url += (this.url.include('?') ? '&' : '?') + params;
      else if (/Konqueror|Safari|KHTML/.test(navigator.userAgent))
        params += '&_=';
    }

    try {
      var response = new Ajax.Response(this);
      if (this.options.onCreate) this.options.onCreate(response);
      Ajax.Responders.dispatch('onCreate', this, response);

      this.transport.open(this.method.toUpperCase(), this.url,
        this.options.asynchronous);

      if (this.options.asynchronous) this.respondToReadyState.bind(this).defer(1);

      this.transport.onreadystatechange = this.onStateChange.bind(this);
      this.setRequestHeaders();

      this.body = this.method == 'post' ? (this.options.postBody || params) : null;
      this.transport.send(this.body);

      /* Force Firefox to handle ready state 4 for synchronous requests */
      if (!this.options.asynchronous && this.transport.overrideMimeType)
        this.onStateChange();

    }
    catch (e) {
      this.dispatchException(e);
    }
  },

  onStateChange: function() {
    var readyState = this.transport.readyState;
    if (readyState > 1 && !((readyState == 4) && this._complete))
      this.respondToReadyState(this.transport.readyState);
  },

  setRequestHeaders: function() {
    var headers = {
      'X-Requested-With': 'XMLHttpRequest',
      'X-Prototype-Version': Prototype.Version,
      'Accept': 'text/javascript, text/html, application/xml, text/xml, */*'
    };

    if (this.method == 'post') {
      headers['Content-type'] = this.options.contentType +
        (this.options.encoding ? '; charset=' + this.options.encoding : '');

      /* Force "Connection: close" for older Mozilla browsers to work
       * around a bug where XMLHttpRequest sends an incorrect
       * Content-length header. See Mozilla Bugzilla #246651.
       */
      if (this.transport.overrideMimeType &&
          (navigator.userAgent.match(/Gecko\/(\d{4})/) || [0,2005])[1] < 2005)
            headers['Connection'] = 'close';
    }

    // user-defined headers
    if (typeof this.options.requestHeaders == 'object') {
      var extras = this.options.requestHeaders;

      if (Object.isFunction(extras.push))
        for (var i = 0, length = extras.length; i < length; i += 2)
          headers[extras[i]] = extras[i+1];
      else
        $H(extras).each(function(pair) { headers[pair.key] = pair.value });
    }

    for (var name in headers)
      this.transport.setRequestHeader(name, headers[name]);
  },

  success: function() {
    var status = this.getStatus();
    return !status || (status >= 200 && status < 300);
  },

  getStatus: function() {
    try {
      return this.transport.status || 0;
    } catch (e) { return 0 }
  },

  respondToReadyState: function(readyState) {
    var state = Ajax.Request.Events[readyState], response = new Ajax.Response(this);

    if (state == 'Complete') {
      try {
        this._complete = true;
        (this.options['on' + response.status]
         || this.options['on' + (this.success() ? 'Success' : 'Failure')]
         || Prototype.emptyFunction)(response, response.headerJSON);
      } catch (e) {
        this.dispatchException(e);
      }

      var contentType = response.getHeader('Content-type');
      if (this.options.evalJS == 'force'
          || (this.options.evalJS && this.isSameOrigin() && contentType
          && contentType.match(/^\s*(text|application)\/(x-)?(java|ecma)script(;.*)?\s*$/i)))
        this.evalResponse();
    }

    try {
      (this.options['on' + state] || Prototype.emptyFunction)(response, response.headerJSON);
      Ajax.Responders.dispatch('on' + state, this, response, response.headerJSON);
    } catch (e) {
      this.dispatchException(e);
    }

    if (state == 'Complete') {
      // avoid memory leak in MSIE: clean up
      this.transport.onreadystatechange = Prototype.emptyFunction;
    }
  },

  isSameOrigin: function() {
    var m = this.url.match(/^\s*https?:\/\/[^\/]*/);
    return !m || (m[0] == '#{protocol}//#{domain}#{port}'.interpolate({
      protocol: location.protocol,
      domain: document.domain,
      port: location.port ? ':' + location.port : ''
    }));
  },

  getHeader: function(name) {
    try {
      return this.transport.getResponseHeader(name) || null;
    } catch (e) { return null }
  },

  evalResponse: function() {
    try {
      return eval((this.transport.responseText || '').unfilterJSON());
    } catch (e) {
      this.dispatchException(e);
    }
  },

  dispatchException: function(exception) {
    (this.options.onException || Prototype.emptyFunction)(this, exception);
    Ajax.Responders.dispatch('onException', this, exception);
  },

  /**
   * Ticket http://dev.rubyonrails.org/ticket/9490
   * Aborts the currently running request and calls onAbort listener
   */
  abort: function(){
    //call onAbort listener, if existent
    (this.options.onAbort || Prototype.emptyFunction)(this.transport, this.json);
    //trash existiting handlers
    this.options={};
    //now abort the request
    this.transport.abort();
  }
});

Ajax.Request.Events =
  ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];

Ajax.Response = Class.create({
  initialize: function(request){
    this.request = request;
    var transport  = this.transport  = request.transport,
        readyState = this.readyState = transport.readyState;

    if((readyState > 2 && !Prototype.Browser.IE) || readyState == 4) {
      this.status       = this.getStatus();
      this.statusText   = this.getStatusText();
      this.responseText = String.interpret(transport.responseText);
      this.headerJSON   = this._getHeaderJSON();
    }

    if(readyState == 4) {
      var xml = transport.responseXML;
      this.responseXML  = Object.isUndefined(xml) ? null : xml;
      this.responseJSON = this._getResponseJSON();
    }
  },

  status:      0,
  statusText: '',

  getStatus: Ajax.Request.prototype.getStatus,

  getStatusText: function() {
    try {
      return this.transport.statusText || '';
    } catch (e) { return '' }
  },

  getHeader: Ajax.Request.prototype.getHeader,

  getAllHeaders: function() {
    try {
      return this.getAllResponseHeaders();
    } catch (e) { return null }
  },

  getResponseHeader: function(name) {
    return this.transport.getResponseHeader(name);
  },

  getAllResponseHeaders: function() {
    return this.transport.getAllResponseHeaders();
  },

  _getHeaderJSON: function() {
    var json = this.getHeader('X-JSON');
    if (!json) return null;
    json = decodeURIComponent(escape(json));
    try {
      return json.evalJSON(this.request.options.sanitizeJSON ||
        !this.request.isSameOrigin());
    } catch (e) {
      this.request.dispatchException(e);
    }
  },

  _getResponseJSON: function() {
    var options = this.request.options;
    if (!options.evalJSON || (options.evalJSON != 'force' &&
      !(this.getHeader('Content-type') || '').include('application/json')) ||
        this.responseText.blank())
          return null;
    try {
      return this.responseText.evalJSON(options.sanitizeJSON ||
        !this.request.isSameOrigin());
    } catch (e) {
      this.request.dispatchException(e);
    }
  }
});

Ajax.Updater = Class.create(Ajax.Request, {
  initialize: function($super, container, url, options) {
    this.container = {
      success: (container.success || container),
      failure: (container.failure || (container.success ? null : container))
    };

    options = Object.clone(options);
    var onComplete = options.onComplete;
    options.onComplete = (function(response, json) {
      this.updateContent(response.responseText);
      if (Object.isFunction(onComplete)) onComplete(response, json);
    }).bind(this);

    $super(url, options);
  },

  updateContent: function(responseText) {
    var receiver = this.container[this.success() ? 'success' : 'failure'],
        options = this.options;

    if (!options.evalScripts) responseText = responseText.stripScripts();

    if (receiver = $(receiver)) {
      if (options.insertion) {
        if (Object.isString(options.insertion)) {
          var insertion = { }; insertion[options.insertion] = responseText;
          receiver.insert(insertion);
        }
        else options.insertion(receiver, responseText);
      }
      else receiver.update(responseText);
    }
  }
});

Ajax.PeriodicalUpdater = Class.create(Ajax.Base, {
  initialize: function($super, container, url, options) {
    $super(options);
    this.onComplete = this.options.onComplete;

    this.frequency = (this.options.frequency || 2);
    this.decay = (this.options.decay || 1);

    this.updater = { };
    this.container = container;
    this.url = url;

    this.start();
  },

  start: function() {
    this.options.onComplete = this.updateComplete.bind(this);
    this.onTimerEvent();
  },

  stop: function() {
    this.updater.options.onComplete = undefined;
    clearTimeout(this.timer);
    (this.onComplete || Prototype.emptyFunction).apply(this, arguments);
  },

  updateComplete: function(response) {
    if (this.options.decay) {
      this.decay = (response.responseText == this.lastText ?
        this.decay * this.options.decay : 1);

      this.lastText = response.responseText;
    }
    this.timer = this.onTimerEvent.bind(this).delay(this.decay * this.frequency);
  },

  onTimerEvent: function() {
    this.updater = new Ajax.Updater(this.container, this.url, this.options);
  }
});
function $(element) {
  if (arguments.length > 1) {
    for (var i = 0, elements = [], length = arguments.length; i < length; i++)
      elements.push($(arguments[i]));
    return elements;
  }
  if (Object.isString(element))
    element = document.getElementById(element);
  return Element.extend(element);
}

if (Prototype.BrowserFeatures.XPath) {
  document._getElementsByXPath = function(expression, parentElement) {
    var results = [];
    var query = document.evaluate(expression, $(parentElement) || document,
      null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
    for (var i = 0, length = query.snapshotLength; i < length; i++)
      results.push(Element.extend(query.snapshotItem(i)));
    return results;
  };
}

/*--------------------------------------------------------------------------*/

if (!window.Node) var Node = { };

if (!Node.ELEMENT_NODE) {
  // DOM level 2 ECMAScript Language Binding
  Object.extend(Node, {
    ELEMENT_NODE: 1,
    ATTRIBUTE_NODE: 2,
    TEXT_NODE: 3,
    CDATA_SECTION_NODE: 4,
    ENTITY_REFERENCE_NODE: 5,
    ENTITY_NODE: 6,
    PROCESSING_INSTRUCTION_NODE: 7,
    COMMENT_NODE: 8,
    DOCUMENT_NODE: 9,
    DOCUMENT_TYPE_NODE: 10,
    DOCUMENT_FRAGMENT_NODE: 11,
    NOTATION_NODE: 12
  });
}

(function() {
  var element = this.Element;
  this.Element = function(tagName, attributes) {
    attributes = attributes || { };
    tagName = tagName.toLowerCase();
    var cache = Element.cache;
    if (Prototype.Browser.IE && attributes.name) {
      tagName = '<' + tagName + ' name="' + attributes.name + '">';
      delete attributes.name;
      return Element.writeAttribute(document.createElement(tagName), attributes);
    }
    if (!cache[tagName]) cache[tagName] = Element.extend(document.createElement(tagName));
    return Element.writeAttribute(cache[tagName].cloneNode(false), attributes);
  };
  Object.extend(this.Element, element || { });
}).call(window);

Element.cache = { };

Element.Methods = {
  visible: function(element) {
    return $(element).style.display != 'none';
  },

  toggle: function(element) {
    element = $(element);
    Element[Element.visible(element) ? 'hide' : 'show'](element);
    return element;
  },

  hide: function(element) {
    $(element).style.display = 'none';
    return element;
  },

  show: function(element) {
    $(element).style.display = '';
    return element;
  },

  remove: function(element) {
    element = $(element);
    element.parentNode.removeChild(element);
    return element;
  },

  update: function(element, content) {
    element = $(element);
    if (content && content.toElement) content = content.toElement();
    if (Object.isElement(content)) return element.update().insert(content);
    content = Object.toHTML(content);
    element.innerHTML = content.stripScripts();
    content.evalScripts.bind(content).defer();
    return element;
  },

  replace: function(element, content) {
    element = $(element);
    if (content && content.toElement) content = content.toElement();
    else if (!Object.isElement(content)) {
      content = Object.toHTML(content);
      var range = element.ownerDocument.createRange();
      range.selectNode(element);
      content.evalScripts.bind(content).defer();
      content = range.createContextualFragment(content.stripScripts());
    }
    element.parentNode.replaceChild(content, element);
    return element;
  },

  insert: function(element, insertions) {
    element = $(element);

    if (Object.isString(insertions) || Object.isNumber(insertions) ||
        Object.isElement(insertions) || (insertions && (insertions.toElement || insertions.toHTML)))
          insertions = {bottom:insertions};

    var content, insert, tagName, childNodes;

    for (var position in insertions) {
      content  = insertions[position];
      position = position.toLowerCase();
      insert = Element._insertionTranslations[position];

      if (content && content.toElement) content = content.toElement();
      if (Object.isElement(content)) {
        insert(element, content);
        continue;
      }

      content = Object.toHTML(content);

      tagName = ((position == 'before' || position == 'after')
        ? element.parentNode : element).tagName.toUpperCase();

      childNodes = Element._getContentFromAnonymousElement(tagName, content.stripScripts());

      if (position == 'top' || position == 'after') childNodes.reverse();
      childNodes.each(insert.curry(element));

      content.evalScripts.bind(content).defer();
    }

    return element;
  },

  wrap: function(element, wrapper, attributes) {
    element = $(element);
    if (Object.isElement(wrapper))
      $(wrapper).writeAttribute(attributes || { });
    else if (Object.isString(wrapper)) wrapper = new Element(wrapper, attributes);
    else wrapper = new Element('div', wrapper);
    if (element.parentNode)
      element.parentNode.replaceChild(wrapper, element);
    wrapper.appendChild(element);
    return wrapper;
  },

  inspect: function(element) {
    element = $(element);
    var result = '<' + element.tagName.toLowerCase();
    $H({'id': 'id', 'className': 'class'}).each(function(pair) {
      var property = pair.first(), attribute = pair.last();
      var value = (element[property] || '').toString();
      if (value) result += ' ' + attribute + '=' + value.inspect(true);
    });
    return result + '>';
  },

  recursivelyCollect: function(element, property) {
    element = $(element);
    var elements = [];
    while (element = element[property])
      if (element.nodeType == 1)
        elements.push(Element.extend(element));
    return elements;
  },

  ancestors: function(element) {
    return $(element).recursivelyCollect('parentNode');
  },

  descendants: function(element) {
    return $(element).select("*");
  },

  firstDescendant: function(element) {
    element = $(element).firstChild;
    while (element && element.nodeType != 1) element = element.nextSibling;
    return $(element);
  },

  immediateDescendants: function(element) {
    if (!(element = $(element).firstChild)) return [];
    while (element && element.nodeType != 1) element = element.nextSibling;
    if (element) return [element].concat($(element).nextSiblings());
    return [];
  },

  previousSiblings: function(element) {
    return $(element).recursivelyCollect('previousSibling');
  },

  nextSiblings: function(element) {
    return $(element).recursivelyCollect('nextSibling');
  },

  siblings: function(element) {
    element = $(element);
    return element.previousSiblings().reverse().concat(element.nextSiblings());
  },

  match: function(element, selector) {
    if (Object.isString(selector))
      selector = new Selector(selector);
    return selector.match($(element));
  },

  up: function(element, expression, index) {
    element = $(element);
    if (arguments.length == 1) return $(element.parentNode);
    var ancestors = element.ancestors();
    return Object.isNumber(expression) ? ancestors[expression] :
      Selector.findElement(ancestors, expression, index);
  },

  down: function(element, expression, index) {
    element = $(element);
    if (arguments.length == 1) return element.firstDescendant();
    return Object.isNumber(expression) ? element.descendants()[expression] :
      element.select(expression)[index || 0];
  },

  previous: function(element, expression, index) {
    element = $(element);
    if (arguments.length == 1) return $(Selector.handlers.previousElementSibling(element));
    var previousSiblings = element.previousSiblings();
    return Object.isNumber(expression) ? previousSiblings[expression] :
      Selector.findElement(previousSiblings, expression, index);
  },

  next: function(element, expression, index) {
    element = $(element);
    if (arguments.length == 1) return $(Selector.handlers.nextElementSibling(element));
    var nextSiblings = element.nextSiblings();
    return Object.isNumber(expression) ? nextSiblings[expression] :
      Selector.findElement(nextSiblings, expression, index);
  },

  select: function() {
    var args = $A(arguments), element = $(args.shift());
    return Selector.findChildElements(element, args);
  },

  adjacent: function() {
    var args = $A(arguments), element = $(args.shift());
    return Selector.findChildElements(element.parentNode, args).without(element);
  },

  identify: function(element) {
    element = $(element);
    var id = element.readAttribute('id'), self = arguments.callee;
    if (id) return id;
    do { id = 'anonymous_element_' + self.counter++ } while ($(id));
    element.writeAttribute('id', id);
    return id;
  },

  readAttribute: function(element, name) {
    element = $(element);
    if (Prototype.Browser.IE) {
      var t = Element._attributeTranslations.read;
      if (t.values[name]) return t.values[name](element, name);
      if (t.names[name]) name = t.names[name];
      if (name.include(':')) {
        return (!element.attributes || !element.attributes[name]) ? null :
         element.attributes[name].value;
      }
    }
    return element.getAttribute(name);
  },

  writeAttribute: function(element, name, value) {
    element = $(element);
    var attributes = { }, t = Element._attributeTranslations.write;

    if (typeof name == 'object') attributes = name;
    else attributes[name] = Object.isUndefined(value) ? true : value;

    for (var attr in attributes) {
      name = t.names[attr] || attr;
      value = attributes[attr];
      if (t.values[attr]) name = t.values[attr](element, value);
      if (value === false || value === null)
        element.removeAttribute(name);
      else if (value === true)
        element.setAttribute(name, name);
      else element.setAttribute(name, value);
    }
    return element;
  },

  getHeight: function(element) {
    return $(element).getDimensions().height;
  },

  getWidth: function(element) {
    return $(element).getDimensions().width;
  },

  classNames: function(element) {
    return new Element.ClassNames(element);
  },

  hasClassName: function(element, className) {
    if (!(element = $(element))) return;
    var elementClassName = element.className;
    return (elementClassName.length > 0 && (elementClassName == className ||
      new RegExp("(^|\\s)" + className + "(\\s|$)").test(elementClassName)));
  },

  addClassName: function(element, className) {
    if (!(element = $(element))) return;
    if (!element.hasClassName(className))
      element.className += (element.className ? ' ' : '') + className;
    return element;
  },

  removeClassName: function(element, className) {
    if (!(element = $(element))) return;
    element.className = element.className.replace(
      new RegExp("(^|\\s+)" + className + "(\\s+|$)"), ' ').strip();
    return element;
  },

  toggleClassName: function(element, className) {
    if (!(element = $(element))) return;
    return element[element.hasClassName(className) ?
      'removeClassName' : 'addClassName'](className);
  },

  // removes whitespace-only text node children
  cleanWhitespace: function(element) {
    element = $(element);
    var node = element.firstChild;
    while (node) {
      var nextNode = node.nextSibling;
      if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
        element.removeChild(node);
      node = nextNode;
    }
    return element;
  },

  empty: function(element) {
    return $(element).innerHTML.blank();
  },

  descendantOf: function(element, ancestor) {
    element = $(element), ancestor = $(ancestor);
    var originalAncestor = ancestor;

    if (element.compareDocumentPosition)
      return (element.compareDocumentPosition(ancestor) & 8) === 8;

    if (element.sourceIndex && !Prototype.Browser.Opera) {
      var e = element.sourceIndex, a = ancestor.sourceIndex,
       nextAncestor = ancestor.nextSibling;
      if (!nextAncestor) {
        do { ancestor = ancestor.parentNode; }
        while (!(nextAncestor = ancestor.nextSibling) && ancestor.parentNode);
      }
      if (nextAncestor && nextAncestor.sourceIndex)
       return (e > a && e < nextAncestor.sourceIndex);
    }

    while (element = element.parentNode)
      if (element == originalAncestor) return true;
    return false;
  },

  scrollTo: function(element) {
    element = $(element);
    var pos = element.cumulativeOffset();
    window.scrollTo(pos[0], pos[1]);
    return element;
  },

  getStyle: function(element, style) {
    element = $(element);
    style = style == 'float' ? 'cssFloat' : style.camelize();
    var value = element.style[style];
    if (!value) {
      var css = document.defaultView.getComputedStyle(element, null);
      value = css ? css[style] : null;
    }
    if (style == 'opacity') return value ? parseFloat(value) : 1.0;
    return value == 'auto' ? null : value;
  },

  getOpacity: function(element) {
    return $(element).getStyle('opacity');
  },

  setStyle: function(element, styles) {
    element = $(element);
    var elementStyle = element.style, match;
    if (Object.isString(styles)) {
      element.style.cssText += ';' + styles;
      return styles.include('opacity') ?
        element.setOpacity(styles.match(/opacity:\s*(\d?\.?\d*)/)[1]) : element;
    }
    for (var property in styles)
      if (property == 'opacity') element.setOpacity(styles[property]);
      else
        elementStyle[(property == 'float' || property == 'cssFloat') ?
          (Object.isUndefined(elementStyle.styleFloat) ? 'cssFloat' : 'styleFloat') :
            property] = styles[property];

    return element;
  },

  setOpacity: function(element, value) {
    element = $(element);
    element.style.opacity = (value == 1 || value === '') ? '' :
      (value < 0.00001) ? 0 : value;
    return element;
  },

  getDimensions: function(element) {
    element = $(element);
    var display = $(element).getStyle('display');
    if (display != 'none' && display != null) // Safari bug
      return {width: element.offsetWidth, height: element.offsetHeight};

    // All *Width and *Height properties give 0 on elements with display none,
    // so enable the element temporarily
    var els = element.style;
    var originalVisibility = els.visibility;
    var originalPosition = els.position;
    var originalDisplay = els.display;
    els.visibility = 'hidden';
    els.position = 'absolute';
    els.display = 'block';
    var originalWidth = element.clientWidth;
    var originalHeight = element.clientHeight;
    els.display = originalDisplay;
    els.position = originalPosition;
    els.visibility = originalVisibility;
    return {width: originalWidth, height: originalHeight};
  },

  makePositioned: function(element) {
    element = $(element);
    var pos = Element.getStyle(element, 'position');
    if (pos == 'static' || !pos) {
      element._madePositioned = true;
      element.style.position = 'relative';
      // Opera returns the offset relative to the positioning context, when an
      // element is position relative but top and left have not been defined
      if (window.opera) {
        element.style.top = 0;
        element.style.left = 0;
      }
    }
    return element;
  },

  undoPositioned: function(element) {
    element = $(element);
    if (element._madePositioned) {
      element._madePositioned = undefined;
      element.style.position =
        element.style.top =
        element.style.left =
        element.style.bottom =
        element.style.right = '';
    }
    return element;
  },

  makeClipping: function(element) {
    element = $(element);
    if (element._overflow) return element;
    element._overflow = Element.getStyle(element, 'overflow') || 'auto';
    if (element._overflow !== 'hidden')
      element.style.overflow = 'hidden';
    return element;
  },

  undoClipping: function(element) {
    element = $(element);
    if (!element._overflow) return element;
    element.style.overflow = element._overflow == 'auto' ? '' : element._overflow;
    element._overflow = null;
    return element;
  },

  cumulativeOffset: function(element) {
    var valueT = 0, valueL = 0;
    do {
      valueT += element.offsetTop  || 0;
      valueL += element.offsetLeft || 0;
      element = element.offsetParent;
    } while (element);
    return Element._returnOffset(valueL, valueT);
  },

  positionedOffset: function(element) {
    var valueT = 0, valueL = 0;
    do {
      valueT += element.offsetTop  || 0;
      valueL += element.offsetLeft || 0;
      element = element.offsetParent;
      if (element) {
        if (element.tagName == 'BODY') break;
        var p = Element.getStyle(element, 'position');
        if (p !== 'static') break;
      }
    } while (element);
    return Element._returnOffset(valueL, valueT);
  },

  absolutize: function(element) {
    element = $(element);
    if (element.getStyle('position') == 'absolute') return;
    // Position.prepare(); // To be done manually by Scripty when it needs it.

    var offsets = element.positionedOffset();
    var top     = offsets[1];
    var left    = offsets[0];
    var width   = element.clientWidth;
    var height  = element.clientHeight;

    element._originalLeft   = left - parseFloat(element.style.left  || 0);
    element._originalTop    = top  - parseFloat(element.style.top || 0);
    element._originalWidth  = element.style.width;
    element._originalHeight = element.style.height;

    element.style.position = 'absolute';
    element.style.top    = top + 'px';
    element.style.left   = left + 'px';
    element.style.width  = width + 'px';
    element.style.height = height + 'px';
    return element;
  },

  relativize: function(element) {
    element = $(element);
    if (element.getStyle('position') == 'relative') return;
    // Position.prepare(); // To be done manually by Scripty when it needs it.

    element.style.position = 'relative';
    var top  = parseFloat(element.style.top  || 0) - (element._originalTop || 0);
    var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);

    element.style.top    = top + 'px';
    element.style.left   = left + 'px';
    element.style.height = element._originalHeight;
    element.style.width  = element._originalWidth;
    return element;
  },

  cumulativeScrollOffset: function(element) {
    var valueT = 0, valueL = 0;
    do {
      valueT += element.scrollTop  || 0;
      valueL += element.scrollLeft || 0;
      element = element.parentNode;
    } while (element);
    return Element._returnOffset(valueL, valueT);
  },

  getOffsetParent: function(element) {
    if (element.offsetParent) return $(element.offsetParent);
    if (element == document.body) return $(element);

    while ((element = element.parentNode) && element != document.body)
      if (Element.getStyle(element, 'position') != 'static')
        return $(element);

    return $(document.body);
  },

  viewportOffset: function(forElement) {
    var valueT = 0, valueL = 0;

    var element = forElement;
    do {
      valueT += element.offsetTop  || 0;
      valueL += element.offsetLeft || 0;

      // Safari fix
      if (element.offsetParent == document.body &&
        Element.getStyle(element, 'position') == 'absolute') break;

    } while (element = element.offsetParent);

    element = forElement;
    do {
      if (!Prototype.Browser.Opera || element.tagName == 'BODY') {
        valueT -= element.scrollTop  || 0;
        valueL -= element.scrollLeft || 0;
      }
    } while (element = element.parentNode);

    return Element._returnOffset(valueL, valueT);
  },

  clonePosition: function(element, source) {
    var options = Object.extend({
      setLeft:    true,
      setTop:     true,
      setWidth:   true,
      setHeight:  true,
      offsetTop:  0,
      offsetLeft: 0
    }, arguments[2] || { });

    // find page position of source
    source = $(source);
    var p = source.viewportOffset();

    // find coordinate system to use
    element = $(element);
    var delta = [0, 0];
    var parent = null;
    // delta [0,0] will do fine with position: fixed elements,
    // position:absolute needs offsetParent deltas
    if (Element.getStyle(element, 'position') == 'absolute') {
      parent = element.getOffsetParent();
      delta = parent.viewportOffset();
    }

    // correct by body offsets (fixes Safari)
    if (parent == document.body) {
      delta[0] -= document.body.offsetLeft;
      delta[1] -= document.body.offsetTop;
    }

    // set position
    if (options.setLeft)   element.style.left  = (p[0] - delta[0] + options.offsetLeft) + 'px';
    if (options.setTop)    element.style.top   = (p[1] - delta[1] + options.offsetTop) + 'px';
    if (options.setWidth)  element.style.width = source.offsetWidth + 'px';
    if (options.setHeight) element.style.height = source.offsetHeight + 'px';
    return element;
  }
};

Element.Methods.identify.counter = 1;

Object.extend(Element.Methods, {
  getElementsBySelector: Element.Methods.select,
  childElements: Element.Methods.immediateDescendants
});

Element._attributeTranslations = {
  write: {
    names: {
      className: 'class',
      htmlFor:   'for'
    },
    values: { }
  }
};

if (Prototype.Browser.Opera) {
  Element.Methods.getStyle = Element.Methods.getStyle.wrap(
    function(proceed, element, style) {
      switch (style) {
        case 'left': case 'top': case 'right': case 'bottom':
          if (proceed(element, 'position') === 'static') return null;
        case 'height': case 'width':
          // returns '0px' for hidden elements; we want it to return null
          if (!Element.visible(element)) return null;

          // returns the border-box dimensions rather than the content-box
          // dimensions, so we subtract padding and borders from the value
          var dim = parseInt(proceed(element, style), 10);

          if (dim !== element['offset' + style.capitalize()])
            return dim + 'px';

          var properties;
          if (style === 'height') {
            properties = ['border-top-width', 'padding-top',
             'padding-bottom', 'border-bottom-width'];
          }
          else {
            properties = ['border-left-width', 'padding-left',
             'padding-right', 'border-right-width'];
          }
          return properties.inject(dim, function(memo, property) {
            var val = proceed(element, property);
            return val === null ? memo : memo - parseInt(val, 10);
          }) + 'px';
        default: return proceed(element, style);
      }
    }
  );

  Element.Methods.readAttribute = Element.Methods.readAttribute.wrap(
    function(proceed, element, attribute) {
      if (attribute === 'title') return element.title;
      return proceed(element, attribute);
    }
  );
}

else if (Prototype.Browser.IE) {
  // IE doesn't report offsets correctly for static elements, so we change them
  // to "relative" to get the values, then change them back.
  Element.Methods.getOffsetParent = Element.Methods.getOffsetParent.wrap(
    function(proceed, element) {
      element = $(element);
      var position = element.getStyle('position');
      if (position !== 'static') return proceed(element);
      element.setStyle({ position: 'relative' });
      var value = proceed(element);
      element.setStyle({ position: position });
      return value;
    }
  );

  $w('positionedOffset viewportOffset').each(function(method) {
    Element.Methods[method] = Element.Methods[method].wrap(
      function(proceed, element) {
        element = $(element);
        var position = element.getStyle('position');
        if (position !== 'static') return proceed(element);
        // Trigger hasLayout on the offset parent so that IE6 reports
        // accurate offsetTop and offsetLeft values for position: fixed.
        var offsetParent = element.getOffsetParent();
        if (offsetParent && offsetParent.getStyle('position') === 'fixed')
          offsetParent.setStyle({ zoom: 1 });
        element.setStyle({ position: 'relative' });
        var value = proceed(element);
        element.setStyle({ position: position });
        return value;
      }
    );
  });

  Element.Methods.getStyle = function(element, style) {
    element = $(element);
    style = (style == 'float' || style == 'cssFloat') ? 'styleFloat' : style.camelize();
    var value = element.style[style];
    if (!value && element.currentStyle) value = element.currentStyle[style];

    if (style == 'opacity') {
      if (value = (element.getStyle('filter') || '').match(/alpha\(opacity=(.*)\)/))
        if (value[1]) return parseFloat(value[1]) / 100;
      return 1.0;
    }

    if (value == 'auto') {
      if ((style == 'width' || style == 'height') && (element.getStyle('display') != 'none'))
        return element['offset' + style.capitalize()] + 'px';
      return null;
    }
    return value;
  };

  Element.Methods.setOpacity = function(element, value) {
    function stripAlpha(filter){
      return filter.replace(/alpha\([^\)]*\)/gi,'');
    }
    element = $(element);
    var currentStyle = element.currentStyle;
    if ((currentStyle && !currentStyle.hasLayout) ||
      (!currentStyle && element.style.zoom == 'normal'))
        element.style.zoom = 1;

    var filter = element.getStyle('filter'), style = element.style;
    if (value == 1 || value === '') {
      (filter = stripAlpha(filter)) ?
        style.filter = filter : style.removeAttribute('filter');
      return element;
    } else if (value < 0.00001) value = 0;
    style.filter = stripAlpha(filter) +
      'alpha(opacity=' + (value * 100) + ')';
    return element;
  };

  Element._attributeTranslations = {
    read: {
      names: {
        'class': 'className',
        'for':   'htmlFor'
      },
      values: {
        _getAttr: function(element, attribute) {
          return element.getAttribute(attribute, 2);
        },
        _getAttrNode: function(element, attribute) {
          var node = element.getAttributeNode(attribute);
          return node ? node.value : "";
        },
        _getEv: function(element, attribute) {
          attribute = element.getAttribute(attribute);
          return attribute ? attribute.toString().slice(23, -2) : null;
        },
        _flag: function(element, attribute) {
          return $(element).hasAttribute(attribute) ? attribute : null;
        },
        style: function(element) {
          return element.style.cssText.toLowerCase();
        },
        title: function(element) {
          return element.title;
        }
      }
    }
  };

  Element._attributeTranslations.write = {
    names: Object.extend({
      cellpadding: 'cellPadding',
      cellspacing: 'cellSpacing'
    }, Element._attributeTranslations.read.names),
    values: {
      checked: function(element, value) {
        element.checked = !!value;
      },

      style: function(element, value) {
        element.style.cssText = value ? value : '';
      }
    }
  };

  Element._attributeTranslations.has = {};

  $w('colSpan rowSpan vAlign dateTime accessKey tabIndex ' +
      'encType maxLength readOnly longDesc').each(function(attr) {
    Element._attributeTranslations.write.names[attr.toLowerCase()] = attr;
    Element._attributeTranslations.has[attr.toLowerCase()] = attr;
  });

  (function(v) {
    Object.extend(v, {
      href:        v._getAttr,
      src:         v._getAttr,
      type:        v._getAttr,
      action:      v._getAttrNode,
      disabled:    v._flag,
      checked:     v._flag,
      readonly:    v._flag,
      multiple:    v._flag,
      onload:      v._getEv,
      onunload:    v._getEv,
      onclick:     v._getEv,
      ondblclick:  v._getEv,
      onmousedown: v._getEv,
      onmouseup:   v._getEv,
      onmouseover: v._getEv,
      onmousemove: v._getEv,
      onmouseout:  v._getEv,
      onfocus:     v._getEv,
      onblur:      v._getEv,
      onkeypress:  v._getEv,
      onkeydown:   v._getEv,
      onkeyup:     v._getEv,
      onsubmit:    v._getEv,
      onreset:     v._getEv,
      onselect:    v._getEv,
      onchange:    v._getEv
    });
  })(Element._attributeTranslations.read.values);
}

else if (Prototype.Browser.Gecko && /rv:1\.8\.0/.test(navigator.userAgent)) {
  Element.Methods.setOpacity = function(element, value) {
    element = $(element);
    element.style.opacity = (value == 1) ? 0.999999 :
      (value === '') ? '' : (value < 0.00001) ? 0 : value;
    return element;
  };
}

else if (Prototype.Browser.WebKit) {
  Element.Methods.setOpacity = function(element, value) {
    element = $(element);
    element.style.opacity = (value == 1 || value === '') ? '' :
      (value < 0.00001) ? 0 : value;

    if (value == 1)
      if(element.tagName == 'IMG' && element.width) {
        element.width++; element.width--;
      } else try {
        var n = document.createTextNode(' ');
        element.appendChild(n);
        element.removeChild(n);
      } catch (e) { }

    return element;
  };

  // Safari returns margins on body which is incorrect if the child is absolutely
  // positioned.  For performance reasons, redefine Element#cumulativeOffset for
  // KHTML/WebKit only.
  Element.Methods.cumulativeOffset = function(element) {
    var valueT = 0, valueL = 0;
    do {
      valueT += element.offsetTop  || 0;
      valueL += element.offsetLeft || 0;
      if (element.offsetParent == document.body)
        if (Element.getStyle(element, 'position') == 'absolute') break;

      element = element.offsetParent;
    } while (element);

    return Element._returnOffset(valueL, valueT);
  };
}

if (Prototype.Browser.IE || Prototype.Browser.Opera) {
  // IE and Opera are missing .innerHTML support for TABLE-related and SELECT elements
  Element.Methods.update = function(element, content) {
    element = $(element);

    if (content && content.toElement) content = content.toElement();
    if (Object.isElement(content)) return element.update().insert(content);

    content = Object.toHTML(content);
    var tagName = element.tagName.toUpperCase();

    if (tagName in Element._insertionTranslations.tags) {
      $A(element.childNodes).each(function(node) { element.removeChild(node) });
      Element._getContentFromAnonymousElement(tagName, content.stripScripts())
        .each(function(node) { element.appendChild(node) });
    }
    else element.innerHTML = content.stripScripts();

    content.evalScripts.bind(content).defer();
    return element;
  };
}

if ('outerHTML' in document.createElement('div')) {
  Element.Methods.replace = function(element, content) {
    element = $(element);

    if (content && content.toElement) content = content.toElement();
    if (Object.isElement(content)) {
      element.parentNode.replaceChild(content, element);
      return element;
    }

    content = Object.toHTML(content);
    var parent = element.parentNode, tagName = parent.tagName.toUpperCase();

    if (Element._insertionTranslations.tags[tagName]) {
      var nextSibling = element.next();
      var fragments = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
      parent.removeChild(element);
      if (nextSibling)
        fragments.each(function(node) { parent.insertBefore(node, nextSibling) });
      else
        fragments.each(function(node) { parent.appendChild(node) });
    }
    else element.outerHTML = content.stripScripts();

    content.evalScripts.bind(content).defer();
    return element;
  };
}

Element._returnOffset = function(l, t) {
  var result = [l, t];
  result.left = l;
  result.top = t;
  return result;
};

Element._getContentFromAnonymousElement = function(tagName, html) {
  var div = new Element('div'), t = Element._insertionTranslations.tags[tagName];
  if (t) {
    div.innerHTML = t[0] + html + t[1];
    t[2].times(function() { div = div.firstChild });
  } else div.innerHTML = html;
  return $A(div.childNodes);
};

Element._insertionTranslations = {
  before: function(element, node) {
    element.parentNode.insertBefore(node, element);
  },
  top: function(element, node) {
    element.insertBefore(node, element.firstChild);
  },
  bottom: function(element, node) {
    element.appendChild(node);
  },
  after: function(element, node) {
    element.parentNode.insertBefore(node, element.nextSibling);
  },
  tags: {
    TABLE:  ['<table>',                '</table>',                   1],
    TBODY:  ['<table><tbody>',         '</tbody></table>',           2],
    TR:     ['<table><tbody><tr>',     '</tr></tbody></table>',      3],
    TD:     ['<table><tbody><tr><td>', '</td></tr></tbody></table>', 4],
    SELECT: ['<select>',               '</select>',                  1]
  }
};

(function() {
  Object.extend(this.tags, {
    THEAD: this.tags.TBODY,
    TFOOT: this.tags.TBODY,
    TH:    this.tags.TD
  });
}).call(Element._insertionTranslations);

Element.Methods.Simulated = {
  hasAttribute: function(element, attribute) {
    attribute = Element._attributeTranslations.has[attribute] || attribute;
    var node = $(element).getAttributeNode(attribute);
    return node && node.specified;
  }
};

Element.Methods.ByTag = { };

Object.extend(Element, Element.Methods);

if (!Prototype.BrowserFeatures.ElementExtensions &&
    document.createElement('div').__proto__) {
  window.HTMLElement = { };
  window.HTMLElement.prototype = document.createElement('div').__proto__;
  Prototype.BrowserFeatures.ElementExtensions = true;
}

Element.extend = (function() {
  if (Prototype.BrowserFeatures.SpecificElementExtensions)
    return Prototype.K;

  var Methods = { }, ByTag = Element.Methods.ByTag;

  var extend = Object.extend(function(element) {
    if (!element || element._extendedByPrototype ||
        element.nodeType != 1 || element == window) return element;

    var methods = Object.clone(Methods),
      tagName = element.tagName, property, value;

    // extend methods for specific tags
    if (ByTag[tagName]) Object.extend(methods, ByTag[tagName]);

    for (property in methods) {
      value = methods[property];
      if (Object.isFunction(value) && !(property in element))
        element[property] = value.methodize();
    }

    element._extendedByPrototype = Prototype.emptyFunction;
    return element;

  }, {
    refresh: function() {
      // extend methods for all tags (Safari doesn't need this)
      if (!Prototype.BrowserFeatures.ElementExtensions) {
        Object.extend(Methods, Element.Methods);
        Object.extend(Methods, Element.Methods.Simulated);
      }
    }
  });

  extend.refresh();
  return extend;
})();

Element.hasAttribute = function(element, attribute) {
  if (element.hasAttribute) return element.hasAttribute(attribute);
  return Element.Methods.Simulated.hasAttribute(element, attribute);
};

Element.addMethods = function(methods) {
  var F = Prototype.BrowserFeatures, T = Element.Methods.ByTag;

  if (!methods) {
    Object.extend(Form, Form.Methods);
    Object.extend(Form.Element, Form.Element.Methods);
    Object.extend(Element.Methods.ByTag, {
      "FORM":     Object.clone(Form.Methods),
      "INPUT":    Object.clone(Form.Element.Methods),
      "SELECT":   Object.clone(Form.Element.Methods),
      "TEXTAREA": Object.clone(Form.Element.Methods)
    });
  }

  if (arguments.length == 2) {
    var tagName = methods;
    methods = arguments[1];
  }

  if (!tagName) Object.extend(Element.Methods, methods || { });
  else {
    if (Object.isArray(tagName)) tagName.each(extend);
    else extend(tagName);
  }

  function extend(tagName) {
    tagName = tagName.toUpperCase();
    if (!Element.Methods.ByTag[tagName])
      Element.Methods.ByTag[tagName] = { };
    Object.extend(Element.Methods.ByTag[tagName], methods);
  }

  function copy(methods, destination, onlyIfAbsent) {
    onlyIfAbsent = onlyIfAbsent || false;
    for (var property in methods) {
      var value = methods[property];
      if (!Object.isFunction(value)) continue;
      if (!onlyIfAbsent || !(property in destination))
        destination[property] = value.methodize();
    }
  }

  function findDOMClass(tagName) {
    var klass;
    var trans = {
      "OPTGROUP": "OptGroup", "TEXTAREA": "TextArea", "P": "Paragraph",
      "FIELDSET": "FieldSet", "UL": "UList", "OL": "OList", "DL": "DList",
      "DIR": "Directory", "H1": "Heading", "H2": "Heading", "H3": "Heading",
      "H4": "Heading", "H5": "Heading", "H6": "Heading", "Q": "Quote",
      "INS": "Mod", "DEL": "Mod", "A": "Anchor", "IMG": "Image", "CAPTION":
      "TableCaption", "COL": "TableCol", "COLGROUP": "TableCol", "THEAD":
      "TableSection", "TFOOT": "TableSection", "TBODY": "TableSection", "TR":
      "TableRow", "TH": "TableCell", "TD": "TableCell", "FRAMESET":
      "FrameSet", "IFRAME": "IFrame"
    };
    if (trans[tagName]) klass = 'HTML' + trans[tagName] + 'Element';
    if (window[klass]) return window[klass];
    klass = 'HTML' + tagName + 'Element';
    if (window[klass]) return window[klass];
    klass = 'HTML' + tagName.capitalize() + 'Element';
    if (window[klass]) return window[klass];

    window[klass] = { };
    window[klass].prototype = document.createElement(tagName).__proto__;
    return window[klass];
  }

  if (F.ElementExtensions) {
    copy(Element.Methods, HTMLElement.prototype);
    copy(Element.Methods.Simulated, HTMLElement.prototype, true);
  }

  if (F.SpecificElementExtensions) {
    for (var tag in Element.Methods.ByTag) {
      var klass = findDOMClass(tag);
      if (Object.isUndefined(klass)) continue;
      copy(T[tag], klass.prototype);
    }
  }

  Object.extend(Element, Element.Methods);
  delete Element.ByTag;

  if (Element.extend.refresh) Element.extend.refresh();
  Element.cache = { };
};

document.viewport = {
  getDimensions: function() {
    var dimensions = { };
    var B = Prototype.Browser;
    $w('width height').each(function(d) {
      var D = d.capitalize();
      dimensions[d] = (B.WebKit && !document.evaluate) ? self['inner' + D] :
        (B.Opera) ? document.body['client' + D] : document.documentElement['client' + D];
    });
    return dimensions;
  },

  getWidth: function() {
    return this.getDimensions().width;
  },

  getHeight: function() {
    return this.getDimensions().height;
  },

  getScrollOffsets: function() {
    return Element._returnOffset(
      window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft,
      window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop);
  }
};
/* Portions of the Selector class are derived from Jack Slocum’s DomQuery,
 * part of YUI-Ext version 0.40, distributed under the terms of an MIT-style
 * license.  Please see http://www.yui-ext.com/ for more information. */

var Selector = Class.create({
  initialize: function(expression) {
    this.expression = expression.strip();
    this.compileMatcher();
  },

  shouldUseXPath: function() {
    if (!Prototype.BrowserFeatures.XPath) return false;

    var e = this.expression;

    // Safari 3 chokes on :*-of-type and :empty
    if (Prototype.Browser.WebKit &&
     (e.include("-of-type") || e.include(":empty")))
      return false;

    // XPath can't do namespaced attributes, nor can it read
    // the "checked" property from DOM nodes
    if ((/(\[[\w-]*?:|:checked)/).test(this.expression))
      return false;

    return true;
  },

  compileMatcher: function() {
    if (this.shouldUseXPath())
      return this.compileXPathMatcher();

    var e = this.expression, ps = Selector.patterns, h = Selector.handlers,
        c = Selector.criteria, le, p, m;

    if (Selector._cache[e]) {
      this.matcher = Selector._cache[e];
      return;
    }

    this.matcher = ["this.matcher = function(root) {",
                    "var r = root, h = Selector.handlers, c = false, n;"];

    while (e && le != e && (/\S/).test(e)) {
      le = e;
      for (var i in ps) {
        p = ps[i];
        if (m = e.match(p)) {
          this.matcher.push(Object.isFunction(c[i]) ? c[i](m) :
    	      new Template(c[i]).evaluate(m));
          e = e.replace(m[0], '');
          break;
        }
      }
    }

    this.matcher.push("return h.unique(n);\n}");
    eval(this.matcher.join('\n'));
    Selector._cache[this.expression] = this.matcher;
  },

  compileXPathMatcher: function() {
    var e = this.expression, ps = Selector.patterns,
        x = Selector.xpath, le, m;

    if (Selector._cache[e]) {
      this.xpath = Selector._cache[e]; return;
    }

    this.matcher = ['.//*'];
    while (e && le != e && (/\S/).test(e)) {
      le = e;
      for (var i in ps) {
        if (m = e.match(ps[i])) {
          this.matcher.push(Object.isFunction(x[i]) ? x[i](m) :
            new Template(x[i]).evaluate(m));
          e = e.replace(m[0], '');
          break;
        }
      }
    }

    this.xpath = this.matcher.join('');
    Selector._cache[this.expression] = this.xpath;
  },

  findElements: function(root) {
    root = root || document;
    if (this.xpath) return document._getElementsByXPath(this.xpath, root);
    return this.matcher(root);
  },

  match: function(element) {
    this.tokens = [];

    var e = this.expression, ps = Selector.patterns, as = Selector.assertions;
    var le, p, m;

    while (e && le !== e && (/\S/).test(e)) {
      le = e;
      for (var i in ps) {
        p = ps[i];
        if (m = e.match(p)) {
          // use the Selector.assertions methods unless the selector
          // is too complex.
          if (as[i]) {
            this.tokens.push([i, Object.clone(m)]);
            e = e.replace(m[0], '');
          } else {
            // reluctantly do a document-wide search
            // and look for a match in the array
            return this.findElements(document).include(element);
          }
        }
      }
    }

    var match = true, name, matches;
    for (var i = 0, token; token = this.tokens[i]; i++) {
      name = token[0], matches = token[1];
      if (!Selector.assertions[name](element, matches)) {
        match = false; break;
      }
    }

    return match;
  },

  toString: function() {
    return this.expression;
  },

  inspect: function() {
    return "#<Selector:" + this.expression.inspect() + ">";
  }
});

Object.extend(Selector, {
  _cache: { },

  xpath: {
    descendant:   "//*",
    child:        "/*",
    adjacent:     "/following-sibling::*[1]",
    laterSibling: '/following-sibling::*',
    tagName:      function(m) {
      if (m[1] == '*') return '';
      return "[local-name()='" + m[1].toLowerCase() +
             "' or local-name()='" + m[1].toUpperCase() + "']";
    },
    className:    "[contains(concat(' ', @class, ' '), ' #{1} ')]",
    id:           "[@id='#{1}']",
    attrPresence: function(m) {
      m[1] = m[1].toLowerCase();
      return new Template("[@#{1}]").evaluate(m);
    },
    attr: function(m) {
      m[1] = m[1].toLowerCase();
      m[3] = m[5] || m[6];
      return new Template(Selector.xpath.operators[m[2]]).evaluate(m);
    },
    pseudo: function(m) {
      var h = Selector.xpath.pseudos[m[1]];
      if (!h) return '';
      if (Object.isFunction(h)) return h(m);
      return new Template(Selector.xpath.pseudos[m[1]]).evaluate(m);
    },
    operators: {
      '=':  "[@#{1}='#{3}']",
      '!=': "[@#{1}!='#{3}']",
      '^=': "[starts-with(@#{1}, '#{3}')]",
      '$=': "[substring(@#{1}, (string-length(@#{1}) - string-length('#{3}') + 1))='#{3}']",
      '*=': "[contains(@#{1}, '#{3}')]",
      '~=': "[contains(concat(' ', @#{1}, ' '), ' #{3} ')]",
      '|=': "[contains(concat('-', @#{1}, '-'), '-#{3}-')]"
    },
    pseudos: {
      'first-child': '[not(preceding-sibling::*)]',
      'last-child':  '[not(following-sibling::*)]',
      'only-child':  '[not(preceding-sibling::* or following-sibling::*)]',
      'empty':       "[count(*) = 0 and (count(text()) = 0 or translate(text(), ' \t\r\n', '') = '')]",
      'checked':     "[@checked]",
      'disabled':    "[@disabled]",
      'enabled':     "[not(@disabled)]",
      'not': function(m) {
        var e = m[6], p = Selector.patterns,
            x = Selector.xpath, le, v;

        var exclusion = [];
        while (e && le != e && (/\S/).test(e)) {
          le = e;
          for (var i in p) {
            if (m = e.match(p[i])) {
              v = Object.isFunction(x[i]) ? x[i](m) : new Template(x[i]).evaluate(m);
              exclusion.push("(" + v.substring(1, v.length - 1) + ")");
              e = e.replace(m[0], '');
              break;
            }
          }
        }
        return "[not(" + exclusion.join(" and ") + ")]";
      },
      'nth-child':      function(m) {
        return Selector.xpath.pseudos.nth("(count(./preceding-sibling::*) + 1) ", m);
      },
      'nth-last-child': function(m) {
        return Selector.xpath.pseudos.nth("(count(./following-sibling::*) + 1) ", m);
      },
      'nth-of-type':    function(m) {
        return Selector.xpath.pseudos.nth("position() ", m);
      },
      'nth-last-of-type': function(m) {
        return Selector.xpath.pseudos.nth("(last() + 1 - position()) ", m);
      },
      'first-of-type':  function(m) {
        m[6] = "1"; return Selector.xpath.pseudos['nth-of-type'](m);
      },
      'last-of-type':   function(m) {
        m[6] = "1"; return Selector.xpath.pseudos['nth-last-of-type'](m);
      },
      'only-of-type':   function(m) {
        var p = Selector.xpath.pseudos; return p['first-of-type'](m) + p['last-of-type'](m);
      },
      nth: function(fragment, m) {
        var mm, formula = m[6], predicate;
        if (formula == 'even') formula = '2n+0';
        if (formula == 'odd')  formula = '2n+1';
        if (mm = formula.match(/^(\d+)$/)) // digit only
          return '[' + fragment + "= " + mm[1] + ']';
        if (mm = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
          if (mm[1] == "-") mm[1] = -1;
          var a = mm[1] ? Number(mm[1]) : 1;
          var b = mm[2] ? Number(mm[2]) : 0;
          predicate = "[((#{fragment} - #{b}) mod #{a} = 0) and " +
          "((#{fragment} - #{b}) div #{a} >= 0)]";
          return new Template(predicate).evaluate({
            fragment: fragment, a: a, b: b });
        }
      }
    }
  },

  criteria: {
    tagName:      'n = h.tagName(n, r, "#{1}", c);      c = false;',
    className:    'n = h.className(n, r, "#{1}", c);    c = false;',
    id:           'n = h.id(n, r, "#{1}", c);           c = false;',
    attrPresence: 'n = h.attrPresence(n, r, "#{1}", c); c = false;',
    attr: function(m) {
      m[3] = (m[5] || m[6]);
      return new Template('n = h.attr(n, r, "#{1}", "#{3}", "#{2}", c); c = false;').evaluate(m);
    },
    pseudo: function(m) {
      if (m[6]) m[6] = m[6].replace(/"/g, '\\"');
      return new Template('n = h.pseudo(n, "#{1}", "#{6}", r, c); c = false;').evaluate(m);
    },
    descendant:   'c = "descendant";',
    child:        'c = "child";',
    adjacent:     'c = "adjacent";',
    laterSibling: 'c = "laterSibling";'
  },

  patterns: {
    // combinators must be listed first
    // (and descendant needs to be last combinator)
    laterSibling: /^\s*~\s*/,
    child:        /^\s*>\s*/,
    adjacent:     /^\s*\+\s*/,
    descendant:   /^\s/,

    // selectors follow
    tagName:      /^\s*(\*|[\w\-]+)(\b|$)?/,
    id:           /^#([\w\-\*]+)(\b|$)/,
    className:    /^\.([\w\-\*]+)(\b|$)/,
    pseudo:
/^:((first|last|nth|nth-last|only)(-child|-of-type)|empty|checked|(en|dis)abled|not)(\((.*?)\))?(\b|$|(?=\s|[:+~>]))/,
    attrPresence: /^\[([\w]+)\]/,
    attr:         /\[((?:[\w-]*:)?[\w-]+)\s*(?:([!^$*~|]?=)\s*((['"])([^\4]*?)\4|([^'"][^\]]*?)))?\]/
  },

  // for Selector.match and Element#match
  assertions: {
    tagName: function(element, matches) {
      return matches[1].toUpperCase() == element.tagName.toUpperCase();
    },

    className: function(element, matches) {
      return Element.hasClassName(element, matches[1]);
    },

    id: function(element, matches) {
      return element.id === matches[1];
    },

    attrPresence: function(element, matches) {
      return Element.hasAttribute(element, matches[1]);
    },

    attr: function(element, matches) {
      var nodeValue = Element.readAttribute(element, matches[1]);
      return nodeValue && Selector.operators[matches[2]](nodeValue, matches[5] || matches[6]);
    }
  },

  handlers: {
    // UTILITY FUNCTIONS
    // joins two collections
    concat: function(a, b) {
      for (var i = 0, node; node = b[i]; i++)
        a.push(node);
      return a;
    },

    // marks an array of nodes for counting
    mark: function(nodes) {
      var _true = Prototype.emptyFunction;
      for (var i = 0, node; node = nodes[i]; i++)
        node._countedByPrototype = _true;
      return nodes;
    },

    unmark: function(nodes) {
      for (var i = 0, node; node = nodes[i]; i++)
        node._countedByPrototype = undefined;
      return nodes;
    },

    // mark each child node with its position (for nth calls)
    // "ofType" flag indicates whether we're indexing for nth-of-type
    // rather than nth-child
    index: function(parentNode, reverse, ofType) {
      parentNode._countedByPrototype = Prototype.emptyFunction;
      if (reverse) {
        for (var nodes = parentNode.childNodes, i = nodes.length - 1, j = 1; i >= 0; i--) {
          var node = nodes[i];
          if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
        }
      } else {
        for (var i = 0, j = 1, nodes = parentNode.childNodes; node = nodes[i]; i++)
          if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
      }
    },

    // filters out duplicates and extends all nodes
    unique: function(nodes) {
      if (nodes.length == 0) return nodes;
      var results = [], n;
      for (var i = 0, l = nodes.length; i < l; i++)
        if (!(n = nodes[i])._countedByPrototype) {
          n._countedByPrototype = Prototype.emptyFunction;
          results.push(Element.extend(n));
        }
      return Selector.handlers.unmark(results);
    },

    // COMBINATOR FUNCTIONS
    descendant: function(nodes) {
      var h = Selector.handlers;
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        h.concat(results, node.getElementsByTagName('*'));
      return results;
    },

    child: function(nodes) {
      var h = Selector.handlers;
      for (var i = 0, results = [], node; node = nodes[i]; i++) {
        for (var j = 0, child; child = node.childNodes[j]; j++)
          if (child.nodeType == 1 && child.tagName != '!') results.push(child);
      }
      return results;
    },

    adjacent: function(nodes) {
      for (var i = 0, results = [], node; node = nodes[i]; i++) {
        var next = this.nextElementSibling(node);
        if (next) results.push(next);
      }
      return results;
    },

    laterSibling: function(nodes) {
      var h = Selector.handlers;
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        h.concat(results, Element.nextSiblings(node));
      return results;
    },

    nextElementSibling: function(node) {
      while (node = node.nextSibling)
	      if (node.nodeType == 1) return node;
      return null;
    },

    previousElementSibling: function(node) {
      while (node = node.previousSibling)
        if (node.nodeType == 1) return node;
      return null;
    },

    // TOKEN FUNCTIONS
    tagName: function(nodes, root, tagName, combinator) {
      var uTagName = tagName.toUpperCase();
      var results = [], h = Selector.handlers;
      if (nodes) {
        if (combinator) {
          // fastlane for ordinary descendant combinators
          if (combinator == "descendant") {
            for (var i = 0, node; node = nodes[i]; i++)
              h.concat(results, node.getElementsByTagName(tagName));
            return results;
          } else nodes = this[combinator](nodes);
          if (tagName == "*") return nodes;
        }
        for (var i = 0, node; node = nodes[i]; i++)
          if (node.tagName.toUpperCase() === uTagName) results.push(node);
        return results;
      } else return root.getElementsByTagName(tagName);
    },

    id: function(nodes, root, id, combinator) {
      var targetNode = $(id), h = Selector.handlers;
      if (!targetNode) return [];
      if (!nodes && root == document) return [targetNode];
      if (nodes) {
        if (combinator) {
          if (combinator == 'child') {
            for (var i = 0, node; node = nodes[i]; i++)
              if (targetNode.parentNode == node) return [targetNode];
          } else if (combinator == 'descendant') {
            for (var i = 0, node; node = nodes[i]; i++)
              if (Element.descendantOf(targetNode, node)) return [targetNode];
          } else if (combinator == 'adjacent') {
            for (var i = 0, node; node = nodes[i]; i++)
              if (Selector.handlers.previousElementSibling(targetNode) == node)
                return [targetNode];
          } else nodes = h[combinator](nodes);
        }
        for (var i = 0, node; node = nodes[i]; i++)
          if (node == targetNode) return [targetNode];
        return [];
      }
      return (targetNode && Element.descendantOf(targetNode, root)) ? [targetNode] : [];
    },

    className: function(nodes, root, className, combinator) {
      if (nodes && combinator) nodes = this[combinator](nodes);
      return Selector.handlers.byClassName(nodes, root, className);
    },

    byClassName: function(nodes, root, className) {
      if (!nodes) nodes = Selector.handlers.descendant([root]);
      var needle = ' ' + className + ' ';
      for (var i = 0, results = [], node, nodeClassName; node = nodes[i]; i++) {
        nodeClassName = node.className;
        if (nodeClassName.length == 0) continue;
        if (nodeClassName == className || (' ' + nodeClassName + ' ').include(needle))
          results.push(node);
      }
      return results;
    },

    attrPresence: function(nodes, root, attr, combinator) {
      if (!nodes) nodes = root.getElementsByTagName("*");
      if (nodes && combinator) nodes = this[combinator](nodes);
      var results = [];
      for (var i = 0, node; node = nodes[i]; i++)
        if (Element.hasAttribute(node, attr)) results.push(node);
      return results;
    },

    attr: function(nodes, root, attr, value, operator, combinator) {
      if (!nodes) nodes = root.getElementsByTagName("*");
      if (nodes && combinator) nodes = this[combinator](nodes);
      var handler = Selector.operators[operator], results = [];
      for (var i = 0, node; node = nodes[i]; i++) {
        var nodeValue = Element.readAttribute(node, attr);
        if (nodeValue === null) continue;
        if (handler(nodeValue, value)) results.push(node);
      }
      return results;
    },

    pseudo: function(nodes, name, value, root, combinator) {
      if (nodes && combinator) nodes = this[combinator](nodes);
      if (!nodes) nodes = root.getElementsByTagName("*");
      return Selector.pseudos[name](nodes, value, root);
    }
  },

  pseudos: {
    'first-child': function(nodes, value, root) {
      for (var i = 0, results = [], node; node = nodes[i]; i++) {
        if (Selector.handlers.previousElementSibling(node)) continue;
          results.push(node);
      }
      return results;
    },
    'last-child': function(nodes, value, root) {
      for (var i = 0, results = [], node; node = nodes[i]; i++) {
        if (Selector.handlers.nextElementSibling(node)) continue;
          results.push(node);
      }
      return results;
    },
    'only-child': function(nodes, value, root) {
      var h = Selector.handlers;
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        if (!h.previousElementSibling(node) && !h.nextElementSibling(node))
          results.push(node);
      return results;
    },
    'nth-child':        function(nodes, formula, root) {
      return Selector.pseudos.nth(nodes, formula, root);
    },
    'nth-last-child':   function(nodes, formula, root) {
      return Selector.pseudos.nth(nodes, formula, root, true);
    },
    'nth-of-type':      function(nodes, formula, root) {
      return Selector.pseudos.nth(nodes, formula, root, false, true);
    },
    'nth-last-of-type': function(nodes, formula, root) {
      return Selector.pseudos.nth(nodes, formula, root, true, true);
    },
    'first-of-type':    function(nodes, formula, root) {
      return Selector.pseudos.nth(nodes, "1", root, false, true);
    },
    'last-of-type':     function(nodes, formula, root) {
      return Selector.pseudos.nth(nodes, "1", root, true, true);
    },
    'only-of-type':     function(nodes, formula, root) {
      var p = Selector.pseudos;
      return p['last-of-type'](p['first-of-type'](nodes, formula, root), formula, root);
    },

    // handles the an+b logic
    getIndices: function(a, b, total) {
      if (a == 0) return b > 0 ? [b] : [];
      return $R(1, total).inject([], function(memo, i) {
        if (0 == (i - b) % a && (i - b) / a >= 0) memo.push(i);
        return memo;
      });
    },

    // handles nth(-last)-child, nth(-last)-of-type, and (first|last)-of-type
    nth: function(nodes, formula, root, reverse, ofType) {
      if (nodes.length == 0) return [];
      if (formula == 'even') formula = '2n+0';
      if (formula == 'odd')  formula = '2n+1';
      var h = Selector.handlers, results = [], indexed = [], m;
      h.mark(nodes);
      for (var i = 0, node; node = nodes[i]; i++) {
        if (!node.parentNode._countedByPrototype) {
          h.index(node.parentNode, reverse, ofType);
          indexed.push(node.parentNode);
        }
      }
      if (formula.match(/^\d+$/)) { // just a number
        formula = Number(formula);
        for (var i = 0, node; node = nodes[i]; i++)
          if (node.nodeIndex == formula) results.push(node);
      } else if (m = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
        if (m[1] == "-") m[1] = -1;
        var a = m[1] ? Number(m[1]) : 1;
        var b = m[2] ? Number(m[2]) : 0;
        var indices = Selector.pseudos.getIndices(a, b, nodes.length);
        for (var i = 0, node, l = indices.length; node = nodes[i]; i++) {
          for (var j = 0; j < l; j++)
            if (node.nodeIndex == indices[j]) results.push(node);
        }
      }
      h.unmark(nodes);
      h.unmark(indexed);
      return results;
    },

    'empty': function(nodes, value, root) {
      for (var i = 0, results = [], node; node = nodes[i]; i++) {
        // IE treats comments as element nodes
        if (node.tagName == '!' || (node.firstChild && !node.innerHTML.match(/^\s*$/))) continue;
        results.push(node);
      }
      return results;
    },

    'not': function(nodes, selector, root) {
      var h = Selector.handlers, selectorType, m;
      var exclusions = new Selector(selector).findElements(root);
      h.mark(exclusions);
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        if (!node._countedByPrototype) results.push(node);
      h.unmark(exclusions);
      return results;
    },

    'enabled': function(nodes, value, root) {
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        if (!node.disabled) results.push(node);
      return results;
    },

    'disabled': function(nodes, value, root) {
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        if (node.disabled) results.push(node);
      return results;
    },

    'checked': function(nodes, value, root) {
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        if (node.checked) results.push(node);
      return results;
    }
  },

  operators: {
    '=':  function(nv, v) { return nv == v; },
    '!=': function(nv, v) { return nv != v; },
    '^=': function(nv, v) { return nv.startsWith(v); },
    '$=': function(nv, v) { return nv.endsWith(v); },
    '*=': function(nv, v) { return nv.include(v); },
    '~=': function(nv, v) { return (' ' + nv + ' ').include(' ' + v + ' '); },
    '|=': function(nv, v) { return ('-' + nv.toUpperCase() + '-').include('-' + v.toUpperCase() + '-'); }
  },

  split: function(expression) {
    var expressions = [];
    expression.scan(/(([\w#:.~>+()\s-]+|\*|\[.*?\])+)\s*(,|$)/, function(m) {
      expressions.push(m[1].strip());
    });
    return expressions;
  },

  matchElements: function(elements, expression) {
    var matches = $$(expression), h = Selector.handlers;
    h.mark(matches);
    for (var i = 0, results = [], element; element = elements[i]; i++)
      if (element._countedByPrototype) results.push(element);
    h.unmark(matches);
    return results;
  },

  findElement: function(elements, expression, index) {
    if (Object.isNumber(expression)) {
      index = expression; expression = false;
    }
    return Selector.matchElements(elements, expression || '*')[index || 0];
  },

  findChildElements: function(element, expressions) {
    expressions = Selector.split(expressions.join(','));
    var results = [], h = Selector.handlers;
    for (var i = 0, l = expressions.length, selector; i < l; i++) {
      selector = new Selector(expressions[i].strip());
      h.concat(results, selector.findElements(element));
    }
    return (l > 1) ? h.unique(results) : results;
  }
});

if (Prototype.Browser.IE) {
  Object.extend(Selector.handlers, {
    // IE returns comment nodes on getElementsByTagName("*").
    // Filter them out.
    concat: function(a, b) {
      for (var i = 0, node; node = b[i]; i++)
        if (node.tagName !== "!") a.push(node);
      return a;
    },

    // IE improperly serializes _countedByPrototype in (inner|outer)HTML.
    unmark: function(nodes) {
      for (var i = 0, node; node = nodes[i]; i++)
        node.removeAttribute('_countedByPrototype');
      return nodes;
    }
  });
}

function $$() {
  return Selector.findChildElements(document, $A(arguments));
}
var Form = {
  reset: function(form) {
    $(form).reset();
    return form;
  },

  serializeElements: function(elements, options) {
    if (typeof options != 'object') options = { hash: !!options };
    else if (Object.isUndefined(options.hash)) options.hash = true;
    var key, value, submitted = false, submit = options.submit;

    var data = elements.inject({ }, function(result, element) {
      if (!element.disabled && element.name) {
        key = element.name; value = $(element).getValue();
        if (value != null && (element.type != 'submit' || (!submitted &&
            submit !== false && (!submit || key == submit) && (submitted = true)))) {
          if (key in result) {
            // a key is already present; construct an array of values
            if (!Object.isArray(result[key])) result[key] = [result[key]];
            result[key].push(value);
          }
          else result[key] = value;
        }
      }
      return result;
    });

    return options.hash ? data : Object.toQueryString(data);
  }
};

Form.Methods = {
  serialize: function(form, options) {
    return Form.serializeElements(Form.getElements(form), options);
  },

  getElements: function(form) {
    return $A($(form).getElementsByTagName('*')).inject([],
      function(elements, child) {
        if (Form.Element.Serializers[child.tagName.toLowerCase()])
          elements.push(Element.extend(child));
        return elements;
      }
    );
  },

  getInputs: function(form, typeName, name) {
    form = $(form);
    var inputs = form.getElementsByTagName('input');

    if (!typeName && !name) return $A(inputs).map(Element.extend);

    for (var i = 0, matchingInputs = [], length = inputs.length; i < length; i++) {
      var input = inputs[i];
      if ((typeName && input.type != typeName) || (name && input.name != name))
        continue;
      matchingInputs.push(Element.extend(input));
    }

    return matchingInputs;
  },

  disable: function(form) {
    form = $(form);
    Form.getElements(form).invoke('disable');
    return form;
  },

  enable: function(form) {
    form = $(form);
    Form.getElements(form).invoke('enable');
    return form;
  },

  findFirstElement: function(form) {
    var elements = $(form).getElements().findAll(function(element) {
      return 'hidden' != element.type && !element.disabled;
    });
    var firstByIndex = elements.findAll(function(element) {
      return element.hasAttribute('tabIndex') && element.tabIndex >= 0;
    }).sortBy(function(element) { return element.tabIndex }).first();

    return firstByIndex ? firstByIndex : elements.find(function(element) {
      return ['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
    });
  },

  focusFirstElement: function(form) {
    form = $(form);
    form.findFirstElement().activate();
    return form;
  },

  request: function(form, options) {
    form = $(form), options = Object.clone(options || { });

    var params = options.parameters, action = form.readAttribute('action') || '';
    if (action.blank()) action = window.location.href;
    options.parameters = form.serialize(true);

    if (params) {
      if (Object.isString(params)) params = params.toQueryParams();
      Object.extend(options.parameters, params);
    }

    if (form.hasAttribute('method') && !options.method)
      options.method = form.method;

    return new Ajax.Request(action, options);
  }
};

/*--------------------------------------------------------------------------*/

Form.Element = {
  focus: function(element) {
    $(element).focus();
    return element;
  },

  select: function(element) {
    $(element).select();
    return element;
  }
};

Form.Element.Methods = {
  serialize: function(element) {
    element = $(element);
    if (!element.disabled && element.name) {
      var value = element.getValue();
      if (value != undefined) {
        var pair = { };
        pair[element.name] = value;
        return Object.toQueryString(pair);
      }
    }
    return '';
  },

  getValue: function(element) {
    element = $(element);
    var method = element.tagName.toLowerCase();
    return Form.Element.Serializers[method](element);
  },

  setValue: function(element, value) {
    element = $(element);
    var method = element.tagName.toLowerCase();
    Form.Element.Serializers[method](element, value);
    return element;
  },

  clear: function(element) {
    $(element).value = '';
    return element;
  },

  present: function(element) {
    return $(element).value != '';
  },

  activate: function(element) {
    element = $(element);
    try {
      element.focus();
      if (element.select && (element.tagName.toLowerCase() != 'input' ||
          !['button', 'reset', 'submit'].include(element.type)))
        element.select();
    } catch (e) { }
    return element;
  },

  disable: function(element) {
    element = $(element);
    element.blur();
    element.disabled = true;
    return element;
  },

  enable: function(element) {
    element = $(element);
    element.disabled = false;
    return element;
  }
};

/*--------------------------------------------------------------------------*/

var Field = Form.Element;
var $F = Form.Element.Methods.getValue;

/*--------------------------------------------------------------------------*/

Form.Element.Serializers = {
  input: function(element, value) {
    switch (element.type.toLowerCase()) {
      case 'checkbox':
      case 'radio':
        return Form.Element.Serializers.inputSelector(element, value);
      default:
        return Form.Element.Serializers.textarea(element, value);
    }
  },

  inputSelector: function(element, value) {
    if (Object.isUndefined(value)) return element.checked ? element.value : null;
    else element.checked = !!value;
  },

  textarea: function(element, value) {
    if (Object.isUndefined(value)) return element.value;
    else element.value = value;
  },

  select: function(element, index) {
    if (Object.isUndefined(index))
      return this[element.type == 'select-one' ?
        'selectOne' : 'selectMany'](element);
    else {
      var opt, value, single = !Object.isArray(index);
      for (var i = 0, length = element.length; i < length; i++) {
        opt = element.options[i];
        value = this.optionValue(opt);
        if (single) {
          if (value == index) {
            opt.selected = true;
            return;
          }
        }
        else opt.selected = index.include(value);
      }
    }
  },

  selectOne: function(element) {
    var index = element.selectedIndex;
    return index >= 0 ? this.optionValue(element.options[index]) : null;
  },

  selectMany: function(element) {
    var values, length = element.length;
    if (!length) return null;

    for (var i = 0, values = []; i < length; i++) {
      var opt = element.options[i];
      if (opt.selected) values.push(this.optionValue(opt));
    }
    return values;
  },

  optionValue: function(opt) {
    // extend element because hasAttribute may not be native
    return Element.extend(opt).hasAttribute('value') ? opt.value : opt.text;
  }
};

/*--------------------------------------------------------------------------*/

Abstract.TimedObserver = Class.create(PeriodicalExecuter, {
  initialize: function($super, element, frequency, callback) {
    $super(callback, frequency);
    this.element   = $(element);
    this.lastValue = this.getValue();
  },

  execute: function() {
    var value = this.getValue();
    if (Object.isString(this.lastValue) && Object.isString(value) ?
        this.lastValue != value : String(this.lastValue) != String(value)) {
      this.callback(this.element, value);
      this.lastValue = value;
    }
  }
});

Form.Element.Observer = Class.create(Abstract.TimedObserver, {
  getValue: function() {
    return Form.Element.getValue(this.element);
  }
});

Form.Observer = Class.create(Abstract.TimedObserver, {
  getValue: function() {
    return Form.serialize(this.element);
  }
});

/*--------------------------------------------------------------------------*/

Abstract.EventObserver = Class.create({
  initialize: function(element, callback) {
    this.element  = $(element);
    this.callback = callback;

    this.lastValue = this.getValue();
    if (this.element.tagName.toLowerCase() == 'form')
      this.registerFormCallbacks();
    else
      this.registerCallback(this.element);
  },

  onElementEvent: function() {
    var value = this.getValue();
    if (this.lastValue != value) {
      this.callback(this.element, value);
      this.lastValue = value;
    }
  },

  registerFormCallbacks: function() {
    Form.getElements(this.element).each(this.registerCallback, this);
  },

  registerCallback: function(element) {
    if (element.type) {
      switch (element.type.toLowerCase()) {
        case 'checkbox':
        case 'radio':
          Event.observe(element, 'click', this.onElementEvent.bind(this));
          break;
        default:
          Event.observe(element, 'change', this.onElementEvent.bind(this));
          break;
      }
    }
  }
});

Form.Element.EventObserver = Class.create(Abstract.EventObserver, {
  getValue: function() {
    return Form.Element.getValue(this.element);
  }
});

Form.EventObserver = Class.create(Abstract.EventObserver, {
  getValue: function() {
    return Form.serialize(this.element);
  }
});
if (!window.Event) var Event = { };

Object.extend(Event, {
  KEY_BACKSPACE: 8,
  KEY_TAB:       9,
  KEY_RETURN:   13,
  KEY_ESC:      27,
  KEY_LEFT:     37,
  KEY_UP:       38,
  KEY_RIGHT:    39,
  KEY_DOWN:     40,
  KEY_DELETE:   46,
  KEY_HOME:     36,
  KEY_END:      35,
  KEY_PAGEUP:   33,
  KEY_PAGEDOWN: 34,
  KEY_INSERT:   45,

  cache: { },

  relatedTarget: function(event) {
    var element;
    switch(event.type) {
      case 'mouseover': element = event.fromElement; break;
      case 'mouseout':  element = event.toElement;   break;
      default: return null;
    }
    return Element.extend(element);
  }
});

Event.Methods = (function() {
  var isButton;

  if (Prototype.Browser.IE) {
    var buttonMap = { 0: 1, 1: 4, 2: 2 };
    isButton = function(event, code) {
      return event.button == buttonMap[code];
    };

  } else if (Prototype.Browser.WebKit) {
    isButton = function(event, code) {
      switch (code) {
        case 0: return event.which == 1 && !event.metaKey;
        case 1: return event.which == 1 && event.metaKey;
        default: return false;
      }
    };

  } else {
    isButton = function(event, code) {
      return event.which ? (event.which === code + 1) : (event.button === code);
    };
  }

  return {
    isLeftClick:   function(event) { return isButton(event, 0) },
    isMiddleClick: function(event) { return isButton(event, 1) },
    isRightClick:  function(event) { return isButton(event, 2) },

    element: function(event) {
      var node = Event.extend(event).target;
      return Element.extend(node.nodeType == Node.TEXT_NODE ? node.parentNode : node);
    },

    findElement: function(event, expression) {
      var element = Event.element(event);
      if (!expression) return element;
      var elements = [element].concat(element.ancestors());
      return Selector.findElement(elements, expression, 0);
    },

    pointer: function(event) {
      return {
        x: event.pageX || (event.clientX +
          (document.documentElement.scrollLeft || document.body.scrollLeft)),
        y: event.pageY || (event.clientY +
          (document.documentElement.scrollTop || document.body.scrollTop))
      };
    },

    pointerX: function(event) { return Event.pointer(event).x },
    pointerY: function(event) { return Event.pointer(event).y },

    stop: function(event) {
      Event.extend(event);
      event.preventDefault();
      event.stopPropagation();
      event.stopped = true;
    }
  };
})();

Event.extend = (function() {
  var methods = Object.keys(Event.Methods).inject({ }, function(m, name) {
    m[name] = Event.Methods[name].methodize();
    return m;
  });

  if (Prototype.Browser.IE) {
    Object.extend(methods, {
      stopPropagation: function() { this.cancelBubble = true },
      preventDefault:  function() { this.returnValue = false },
      inspect: function() { return "[object Event]" }
    });

    return function(event) {
      if (!event) return false;
      if (event._extendedByPrototype) return event;

      event._extendedByPrototype = Prototype.emptyFunction;
      var pointer = Event.pointer(event);
      Object.extend(event, {
        target: event.srcElement,
        relatedTarget: Event.relatedTarget(event),
        pageX:  pointer.x,
        pageY:  pointer.y
      });
      return Object.extend(event, methods);
    };

  } else {
    Event.prototype = Event.prototype || document.createEvent("HTMLEvents").__proto__;
    Object.extend(Event.prototype, methods);
    return Prototype.K;
  }
})();

Object.extend(Event, (function() {
  var cache = Event.cache;

  function getEventID(element) {
    if (element._prototypeEventID) return element._prototypeEventID[0];
    arguments.callee.id = arguments.callee.id || 1;
    return element._prototypeEventID = [++arguments.callee.id];
  }

  function getDOMEventName(eventName) {
    if (eventName && eventName.include(':')) return "dataavailable";
    return eventName;
  }

  function getCacheForID(id) {
    return cache[id] = cache[id] || { };
  }

  function getWrappersForEventName(id, eventName) {
    var c = getCacheForID(id);
    return c[eventName] = c[eventName] || [];
  }

  function createWrapper(element, eventName, handler) {
    var id = getEventID(element);
    var c = getWrappersForEventName(id, eventName);
    if (c.pluck("handler").include(handler)) return false;

    var wrapper = function(event) {
      if (!Event || !Event.extend ||
        (event.eventName && event.eventName != eventName))
          return false;

      Event.extend(event);
      handler.call(element, event);
    };

    wrapper.handler = handler;
    c.push(wrapper);
    return wrapper;
  }

  function findWrapper(id, eventName, handler) {
    var c = getWrappersForEventName(id, eventName);
    return c.find(function(wrapper) { return wrapper.handler == handler });
  }

  function destroyWrapper(id, eventName, handler) {
    var c = getCacheForID(id);
    if (!c[eventName]) return false;
    c[eventName] = c[eventName].without(findWrapper(id, eventName, handler));
  }

  function destroyCache() {
    for (var id in cache)
      for (var eventName in cache[id])
        cache[id][eventName] = null;
  }

  if (window.attachEvent) {
    window.attachEvent("onunload", destroyCache);
  }

  return {
    observe: function(element, eventName, handler) {
      element = $(element);
      var name = getDOMEventName(eventName);

      var wrapper = createWrapper(element, eventName, handler);
      if (!wrapper) return element;

      if (element.addEventListener) {
        element.addEventListener(name, wrapper, false);
      } else {
        element.attachEvent("on" + name, wrapper);
      }

      return element;
    },

    stopObserving: function(element, eventName, handler) {
      element = $(element);
      var id = getEventID(element), name = getDOMEventName(eventName);

      if (!handler && eventName) {
        getWrappersForEventName(id, eventName).each(function(wrapper) {
          element.stopObserving(eventName, wrapper.handler);
        });
        return element;

      } else if (!eventName) {
        Object.keys(getCacheForID(id)).each(function(eventName) {
          element.stopObserving(eventName);
        });
        return element;
      }

      var wrapper = findWrapper(id, eventName, handler);
      if (!wrapper) return element;

      if (element.removeEventListener) {
        element.removeEventListener(name, wrapper, false);
      } else {
        element.detachEvent("on" + name, wrapper);
      }

      destroyWrapper(id, eventName, handler);

      return element;
    },

    fire: function(element, eventName, memo) {
      element = $(element);
      if (element == document && document.createEvent && !element.dispatchEvent)
        element = document.documentElement;

      var event;
      if (document.createEvent) {
        event = document.createEvent("HTMLEvents");
        event.initEvent("dataavailable", true, true);
      } else {
        event = document.createEventObject();
        event.eventType = "ondataavailable";
      }

      event.eventName = eventName;
      event.memo = memo || { };

      if (document.createEvent) {
        element.dispatchEvent(event);
      } else {
        element.fireEvent(event.eventType, event);
      }

      return Event.extend(event);
    }
  };
})());

Object.extend(Event, Event.Methods);

Element.addMethods({
  fire:          Event.fire,
  observe:       Event.observe,
  stopObserving: Event.stopObserving
});

Object.extend(document, {
  fire:          Element.Methods.fire.methodize(),
  observe:       Element.Methods.observe.methodize(),
  stopObserving: Element.Methods.stopObserving.methodize(),
  loaded:        false
});

(function() {
  /* Support for the DOMContentLoaded event is based on work by Dan Webb,
     Matthias Miller, Dean Edwards and John Resig. */

  var timer;

  function fireContentLoadedEvent() {
    if (document.loaded) return;
    if (timer) window.clearInterval(timer);
    document.fire("dom:loaded");
    document.loaded = true;
  }

  if (document.addEventListener) {
    if (Prototype.Browser.WebKit) {
      timer = window.setInterval(function() {
        if (/loaded|complete/.test(document.readyState))
          fireContentLoadedEvent();
      }, 0);

      Event.observe(window, "load", fireContentLoadedEvent);

    } else {
      document.addEventListener("DOMContentLoaded",
        fireContentLoadedEvent, false);
    }

  } else {
    document.write("<script id=__onDOMContentLoaded defer src=//:><\/script>");
    $("__onDOMContentLoaded").onreadystatechange = function() {
      if (this.readyState == "complete") {
        this.onreadystatechange = null;
        // fireContentLoadedEvent();  // GR disabled on purpose dom:loaded in IE. See last script in layouts/application.rhtml.
      }
    };
  }
})();
/*------------------------------- DEPRECATED -------------------------------*/

Hash.toQueryString = Object.toQueryString;

var Toggle = { display: Element.toggle };

Element.Methods.childOf = Element.Methods.descendantOf;

var Insertion = {
  Before: function(element, content) {
    return Element.insert(element, {before:content});
  },

  Top: function(element, content) {
    return Element.insert(element, {top:content});
  },

  Bottom: function(element, content) {
    return Element.insert(element, {bottom:content});
  },

  After: function(element, content) {
    return Element.insert(element, {after:content});
  }
};

var $continue = new Error('"throw $continue" is deprecated, use "return" instead');

// This should be moved to script.aculo.us; notice the deprecated methods
// further below, that map to the newer Element methods.
var Position = {
  // set to true if needed, warning: firefox performance problems
  // NOT neeeded for page scrolling, only if draggable contained in
  // scrollable elements
  includeScrollOffsets: false,

  // must be called before calling withinIncludingScrolloffset, every time the
  // page is scrolled
  prepare: function() {
    this.deltaX =  window.pageXOffset
                || document.documentElement.scrollLeft
                || document.body.scrollLeft
                || 0;
    this.deltaY =  window.pageYOffset
                || document.documentElement.scrollTop
                || document.body.scrollTop
                || 0;
  },

  // caches x/y coordinate pair to use with overlap
  within: function(element, x, y) {
    if (this.includeScrollOffsets)
      return this.withinIncludingScrolloffsets(element, x, y);
    this.xcomp = x;
    this.ycomp = y;
    this.offset = Element.cumulativeOffset(element);

    return (y >= this.offset[1] &&
            y <  this.offset[1] + element.offsetHeight &&
            x >= this.offset[0] &&
            x <  this.offset[0] + element.offsetWidth);
  },

  withinIncludingScrolloffsets: function(element, x, y) {
    var offsetcache = Element.cumulativeScrollOffset(element);

    this.xcomp = x + offsetcache[0] - this.deltaX;
    this.ycomp = y + offsetcache[1] - this.deltaY;
    this.offset = Element.cumulativeOffset(element);

    return (this.ycomp >= this.offset[1] &&
            this.ycomp <  this.offset[1] + element.offsetHeight &&
            this.xcomp >= this.offset[0] &&
            this.xcomp <  this.offset[0] + element.offsetWidth);
  },

  // within must be called directly before
  overlap: function(mode, element) {
    if (!mode) return 0;
    if (mode == 'vertical')
      return ((this.offset[1] + element.offsetHeight) - this.ycomp) /
        element.offsetHeight;
    if (mode == 'horizontal')
      return ((this.offset[0] + element.offsetWidth) - this.xcomp) /
        element.offsetWidth;
  },

  // Deprecation layer -- use newer Element methods now (1.5.2).

  cumulativeOffset: Element.Methods.cumulativeOffset,

  positionedOffset: Element.Methods.positionedOffset,

  absolutize: function(element) {
    Position.prepare();
    return Element.absolutize(element);
  },

  relativize: function(element) {
    Position.prepare();
    return Element.relativize(element);
  },

  realOffset: Element.Methods.cumulativeScrollOffset,

  offsetParent: Element.Methods.getOffsetParent,

  page: Element.Methods.viewportOffset,

  clone: function(source, target, options) {
    options = options || { };
    return Element.clonePosition(target, source, options);
  }
};

/*--------------------------------------------------------------------------*/

if (!document.getElementsByClassName) document.getElementsByClassName = function(instanceMethods){
  function iter(name) {
    return name.blank() ? null : "[contains(concat(' ', @class, ' '), ' " + name + " ')]";
  }

  instanceMethods.getElementsByClassName = Prototype.BrowserFeatures.XPath ?
  function(element, className) {
    className = className.toString().strip();
    var cond = /\s/.test(className) ? $w(className).map(iter).join('') : iter(className);
    return cond ? document._getElementsByXPath('.//*' + cond, element) : [];
  } : function(element, className) {
    className = className.toString().strip();
    var elements = [], classNames = (/\s/.test(className) ? $w(className) : null);
    if (!classNames && !className) return elements;

    var nodes = $(element).getElementsByTagName('*');
    className = ' ' + className + ' ';

    for (var i = 0, child, cn; child = nodes[i]; i++) {
      if (child.className && (cn = ' ' + child.className + ' ') && (cn.include(className) ||
          (classNames && classNames.all(function(name) {
            return !name.toString().blank() && cn.include(' ' + name + ' ');
          }))))
        elements.push(Element.extend(child));
    }
    return elements;
  };

  return function(className, parentElement) {
    return $(parentElement || document.body).getElementsByClassName(className);
  };
}(Element.Methods);

/*--------------------------------------------------------------------------*/

Element.ClassNames = Class.create();
Element.ClassNames.prototype = {
  initialize: function(element) {
    this.element = $(element);
  },

  _each: function(iterator) {
    this.element.className.split(/\s+/).select(function(name) {
      return name.length > 0;
    })._each(iterator);
  },

  set: function(className) {
    this.element.className = className;
  },

  add: function(classNameToAdd) {
    if (this.include(classNameToAdd)) return;
    this.set($A(this).concat(classNameToAdd).join(' '));
  },

  remove: function(classNameToRemove) {
    if (!this.include(classNameToRemove)) return;
    this.set($A(this).without(classNameToRemove).join(' '));
  },

  toString: function() {
    return $A(this).join(' ');
  }
};

Object.extend(Element.ClassNames.prototype, Enumerable);

/*--------------------------------------------------------------------------*/

Element.addMethods();

// Our method adding mechanism

MMT.CSSClassBehaviors = {};
MMT.CSSClassesWithBehavior = [];
MMT.CSSClassThatNeedsBehaviorAwaking = [];

MMT.additionalMethodsForElement = function(element)
{
  var classes = Element.ClassNames(element); // should probably avoid this overhead by splitting className string ourselves
  var additionalMethods = null; 
  
  for (var i=0, len=classes.length; i<len; ++i) {
    var behavior = MMT.CSSClassBehaviors[classes[i]];
    if (behavior) {
      if (additionalMethods == null) additionalMethods = {};
      Object.Extend(additionalMethods, behavior); 
    }
  }
  
  return additionalMethods;
};

MMT.addBehaviorToCSSClass = function(cssClass, behavior) 
{
  var existingBehavior = MMT.CSSClassBehaviors[cssClass];
  var newBehavior;
  if (!existingBehavior) {
    newBehavior = {};
    MMT.CSSClassesWithBehavior.push(cssClass);
  }
  else newBehavior = existingBehavior;
  
  Object.extend(newBehavior, behavior);
  MMT.CSSClassBehaviors[cssClass] = newBehavior;
  
  if (newBehavior.awakeBehavior) {
    MMT.CSSClassThatNeedsBehaviorAwaking.push(cssClass);
  }
};


MMT.setupBehaviorsOnSubtree = function(rootElement) 
{
  for (var i=0, len=MMT.CSSClassesWithBehavior.length; i<len; ++i) {
    var classname = MMT.CSSClassesWithBehavior[i];
    
    var subelements = rootElement.getElementsByClassName(classname);
    for (var j=0, jlen = subelements.length; j<jlen; ++j) {
      var subelement = subelements[j];
      
      Object.extend(subelement, MMT.CSSClassBehaviors[classname]);
      // xxx - should not be done here
      if (subelement.awakeBehavior) subelement.awakeBehavior();
    }
  }
};

MMT.domLoadHandler = function(event) 
{
 MMT.setupBehaviorsOnSubtree(document); 
 Event.fire(document, 'mmt:load-behaviours');

 Event.fire(document, 'mmt:awake-behaviours');

 Event.fire(document, 'mmt:dom-loaded');
}

document.observe('dom:loaded', MMT.domLoadHandler); 


// Copyright (c) 2005-2007 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
// Contributors:
//  Justin Palmer (http://encytemedia.com/)
//  Mark Pilgrim (http://diveintomark.org/)
//  Martin Bialasinki
// 
// script.aculo.us is freely distributable under the terms of an MIT-style license.
// For details, see the script.aculo.us web site: http://script.aculo.us/ 

// converts rgb() and #xxx to #xxxxxx format,  
// returns self (or first argument) if not convertable  
String.prototype.parseColor = function() {  
  var color = '#';
  if (this.slice(0,4) == 'rgb(') {  
    var cols = this.slice(4,this.length-1).split(',');  
    var i=0; do { color += parseInt(cols[i]).toColorPart() } while (++i<3);  
  } else {  
    if (this.slice(0,1) == '#') {  
      if (this.length==4) for(var i=1;i<4;i++) color += (this.charAt(i) + this.charAt(i)).toLowerCase();  
      if (this.length==7) color = this.toLowerCase();  
    }  
  }  
  return (color.length==7 ? color : (arguments[0] || this));  
};

/*--------------------------------------------------------------------------*/

Element.collectTextNodes = function(element) {  
  return $A($(element).childNodes).collect( function(node) {
    return (node.nodeType==3 ? node.nodeValue : 
      (node.hasChildNodes() ? Element.collectTextNodes(node) : ''));
  }).flatten().join('');
};

Element.collectTextNodesIgnoreClass = function(element, className) {  
  return $A($(element).childNodes).collect( function(node) {
    return (node.nodeType==3 ? node.nodeValue : 
      ((node.hasChildNodes() && !Element.hasClassName(node,className)) ? 
        Element.collectTextNodesIgnoreClass(node, className) : ''));
  }).flatten().join('');
};

Element.setContentZoom = function(element, percent) {
  element = $(element);  
  element.setStyle({fontSize: (percent/100) + 'em'});   
  if (Prototype.Browser.WebKit) window.scrollBy(0,0);
  return element;
};

Element.getInlineOpacity = function(element){
  return $(element).style.opacity || '';
};

Element.forceRerendering = function(element) {
  try {
    element = $(element);
    var n = document.createTextNode(' ');
    element.appendChild(n);
    element.removeChild(n);
  } catch(e) { }
};

/*--------------------------------------------------------------------------*/

var Effect = {
  _elementDoesNotExistError: {
    name: 'ElementDoesNotExistError',
    message: 'The specified DOM element does not exist, but is required for this effect to operate'
  },
  Transitions: {
    linear: Prototype.K,
    sinoidal: function(pos) {
      return (-Math.cos(pos*Math.PI)/2) + 0.5;
    },
    reverse: function(pos) {
      return 1-pos;
    },
    flicker: function(pos) {
      var pos = ((-Math.cos(pos*Math.PI)/4) + 0.75) + Math.random()/4;
      return pos > 1 ? 1 : pos;
    },
    wobble: function(pos) {
      return (-Math.cos(pos*Math.PI*(9*pos))/2) + 0.5;
    },
    pulse: function(pos, pulses) { 
      pulses = pulses || 5; 
      return (
        ((pos % (1/pulses)) * pulses).round() == 0 ? 
              ((pos * pulses * 2) - (pos * pulses * 2).floor()) : 
          1 - ((pos * pulses * 2) - (pos * pulses * 2).floor())
        );
    },
    spring: function(pos) { 
      return 1 - (Math.cos(pos * 4.5 * Math.PI) * Math.exp(-pos * 6)); 
    },
    none: function(pos) {
      return 0;
    },
    full: function(pos) {
      return 1;
    }
  },
  DefaultOptions: {
    duration:   1.0,   // seconds
    fps:        100,   // 100= assume 66fps max.
    sync:       false, // true for combining
    from:       0.0,
    to:         1.0,
    delay:      0.0,
    queue:      'parallel'
  },
  tagifyText: function(element) {
    var tagifyStyle = 'position:relative';
    if (Prototype.Browser.IE) tagifyStyle += ';zoom:1';
    
    element = $(element);
    $A(element.childNodes).each( function(child) {
      if (child.nodeType==3) {
        child.nodeValue.toArray().each( function(character) {
          element.insertBefore(
            new Element('span', {style: tagifyStyle}).update(
              character == ' ' ? String.fromCharCode(160) : character), 
              child);
        });
        Element.remove(child);
      }
    });
  },
  multiple: function(element, effect) {
    var elements;
    if (((typeof element == 'object') || 
        Object.isFunction(element)) && 
       (element.length))
      elements = element;
    else
      elements = $(element).childNodes;
      
    var options = Object.extend({
      speed: 0.1,
      delay: 0.0
    }, arguments[2] || { });
    var masterDelay = options.delay;

    $A(elements).each( function(element, index) {
      new effect(element, Object.extend(options, { delay: index * options.speed + masterDelay }));
    });
  },
  PAIRS: {
    'slide':  ['SlideDown','SlideUp'],
    'blind':  ['BlindDown','BlindUp'],
    'appear': ['Appear','Fade']
  },
  toggle: function(element, effect) {
    element = $(element);
    effect = (effect || 'appear').toLowerCase();
    var options = Object.extend({
      queue: { position:'end', scope:(element.id || 'global'), limit: 1 }
    }, arguments[2] || { });
    Effect[element.visible() ? 
      Effect.PAIRS[effect][1] : Effect.PAIRS[effect][0]](element, options);
  }
};

Effect.DefaultOptions.transition = Effect.Transitions.sinoidal;

/* ------------- core effects ------------- */

Effect.ScopedQueue = Class.create(Enumerable, {
  initialize: function() {
    this.effects  = [];
    this.interval = null;    
  },
  _each: function(iterator) {
    this.effects._each(iterator);
  },
  add: function(effect) {
    var timestamp = new Date().getTime();
    
    var position = Object.isString(effect.options.queue) ? 
      effect.options.queue : effect.options.queue.position;
    
    switch(position) {
      case 'front':
        // move unstarted effects after this effect  
        this.effects.findAll(function(e){ return e.state=='idle' }).each( function(e) {
            e.startOn  += effect.finishOn;
            e.finishOn += effect.finishOn;
          });
        break;
      case 'with-last':
        timestamp = this.effects.pluck('startOn').max() || timestamp;
        break;
      case 'end':
        // start effect after last queued effect has finished
        timestamp = this.effects.pluck('finishOn').max() || timestamp;
        break;
    }
    
    effect.startOn  += timestamp;
    effect.finishOn += timestamp;

    if (!effect.options.queue.limit || (this.effects.length < effect.options.queue.limit))
      this.effects.push(effect);
    
    if (!this.interval)
      this.interval = setInterval(this.loop.bind(this), 15);
  },
  remove: function(effect) {
    this.effects = this.effects.reject(function(e) { return e==effect });
    if (this.effects.length == 0) {
      clearInterval(this.interval);
      this.interval = null;
    }
  },
  loop: function() {
    var timePos = new Date().getTime();
    for(var i=0, len=this.effects.length;i<len;i++) 
      this.effects[i] && this.effects[i].loop(timePos);
  }
});

Effect.Queues = {
  instances: $H(),
  get: function(queueName) {
    if (!Object.isString(queueName)) return queueName;
    
    return this.instances.get(queueName) ||
      this.instances.set(queueName, new Effect.ScopedQueue());
  }
};
Effect.Queue = Effect.Queues.get('global');

Effect.Base = Class.create({
  position: null,
  start: function(options) {
    function codeForEvent(options,eventName){
      return (
        (options[eventName+'Internal'] ? 'this.options.'+eventName+'Internal(this);' : '') +
        (options[eventName] ? 'this.options.'+eventName+'(this);' : '')
      );
    }
    if (options && options.transition === false) options.transition = Effect.Transitions.linear;
    this.options      = Object.extend(Object.extend({ },Effect.DefaultOptions), options || { });
    this.currentFrame = 0;
    this.state        = 'idle';
    this.startOn      = this.options.delay*1000;
    this.finishOn     = this.startOn+(this.options.duration*1000);
    this.fromToDelta  = this.options.to-this.options.from;
    this.totalTime    = this.finishOn-this.startOn;
    this.totalFrames  = this.options.fps*this.options.duration;
    
    eval('this.render = function(pos){ '+
      'if (this.state=="idle"){this.state="running";'+
      codeForEvent(this.options,'beforeSetup')+
      (this.setup ? 'this.setup();':'')+ 
      codeForEvent(this.options,'afterSetup')+
      '};if (this.state=="running"){'+
      'pos=this.options.transition(pos)*'+this.fromToDelta+'+'+this.options.from+';'+
      'this.position=pos;'+
      codeForEvent(this.options,'beforeUpdate')+
      (this.update ? 'this.update(pos);':'')+
      codeForEvent(this.options,'afterUpdate')+
      '}}');
    
    this.event('beforeStart');
    if (!this.options.sync)
      Effect.Queues.get(Object.isString(this.options.queue) ? 
        'global' : this.options.queue.scope).add(this);
  },
  loop: function(timePos) {
    if (timePos >= this.startOn) {
      if (timePos >= this.finishOn) {
        this.render(1.0);
        this.cancel();
        this.event('beforeFinish');
        if (this.finish) this.finish(); 
        this.event('afterFinish');
        return;  
      }
      var pos   = (timePos - this.startOn) / this.totalTime,
          frame = (pos * this.totalFrames).round();
      if (frame > this.currentFrame) {
        this.render(pos);
        this.currentFrame = frame;
      }
    }
  },
  cancel: function() {
    if (!this.options.sync)
      Effect.Queues.get(Object.isString(this.options.queue) ? 
        'global' : this.options.queue.scope).remove(this);
    this.state = 'finished';
  },
  event: function(eventName) {
    if (this.options[eventName + 'Internal']) this.options[eventName + 'Internal'](this);
    if (this.options[eventName]) this.options[eventName](this);
  },
  inspect: function() {
    var data = $H();
    for(property in this)
      if (!Object.isFunction(this[property])) data.set(property, this[property]);
    return '#<Effect:' + data.inspect() + ',options:' + $H(this.options).inspect() + '>';
  }
});

Effect.Parallel = Class.create(Effect.Base, {
  initialize: function(effects) {
    this.effects = effects || [];
    this.start(arguments[1]);
  },
  update: function(position) {
    this.effects.invoke('render', position);
  },
  finish: function(position) {
    this.effects.each( function(effect) {
      effect.render(1.0);
      effect.cancel();
      effect.event('beforeFinish');
      if (effect.finish) effect.finish(position);
      effect.event('afterFinish');
    });
  }
});

Effect.Tween = Class.create(Effect.Base, {
  initialize: function(object, from, to) {
    object = Object.isString(object) ? $(object) : object;
    var args = $A(arguments), method = args.last(), 
      options = args.length == 5 ? args[3] : null;
    this.method = Object.isFunction(method) ? method.bind(object) :
      Object.isFunction(object[method]) ? object[method].bind(object) : 
      function(value) { object[method] = value };
    this.start(Object.extend({ from: from, to: to }, options || { }));
  },
  update: function(position) {
    this.method(position);
  }
});

Effect.Event = Class.create(Effect.Base, {
  initialize: function() {
    this.start(Object.extend({ duration: 0 }, arguments[0] || { }));
  },
  update: Prototype.emptyFunction
});

Effect.Opacity = Class.create(Effect.Base, {
  initialize: function(element) {
    this.element = $(element);
    if (!this.element) throw(Effect._elementDoesNotExistError);
    // make this work on IE on elements without 'layout'
    if (Prototype.Browser.IE && (!this.element.currentStyle.hasLayout))
      this.element.setStyle({zoom: 1});
    var options = Object.extend({
      from: this.element.getOpacity() || 0.0,
      to:   1.0
    }, arguments[1] || { });
    this.start(options);
  },
  update: function(position) {
    this.element.setOpacity(position);
  }
});

Effect.Move = Class.create(Effect.Base, {
  initialize: function(element) {
    this.element = $(element);
    if (!this.element) throw(Effect._elementDoesNotExistError);
    var options = Object.extend({
      x:    0,
      y:    0,
      mode: 'relative'
    }, arguments[1] || { });
    this.start(options);
  },
  setup: function() {
    this.element.makePositioned();
    this.originalLeft = parseFloat(this.element.getStyle('left') || '0');
    this.originalTop  = parseFloat(this.element.getStyle('top')  || '0');
    if (this.options.mode == 'absolute') {
      this.options.x = this.options.x - this.originalLeft;
      this.options.y = this.options.y - this.originalTop;
    }
  },
  update: function(position) {
    this.element.setStyle({
      left: (this.options.x  * position + this.originalLeft).round() + 'px',
      top:  (this.options.y  * position + this.originalTop).round()  + 'px'
    });
  }
});

// for backwards compatibility
Effect.MoveBy = function(element, toTop, toLeft) {
  return new Effect.Move(element, 
    Object.extend({ x: toLeft, y: toTop }, arguments[3] || { }));
};

Effect.Scale = Class.create(Effect.Base, {
  initialize: function(element, percent) {
    this.element = $(element);
    if (!this.element) throw(Effect._elementDoesNotExistError);
    var options = Object.extend({
      scaleX: true,
      scaleY: true,
      scaleContent: true,
      scaleFromCenter: false,
      scaleMode: 'box',        // 'box' or 'contents' or { } with provided values
      scaleFrom: 100.0,
      scaleTo:   percent
    }, arguments[2] || { });
    this.start(options);
  },
  setup: function() {
    this.restoreAfterFinish = this.options.restoreAfterFinish || false;
    this.elementPositioning = this.element.getStyle('position');
    
    this.originalStyle = { };
    ['top','left','width','height','fontSize'].each( function(k) {
      this.originalStyle[k] = this.element.style[k];
    }.bind(this));
      
    this.originalTop  = this.element.offsetTop;
    this.originalLeft = this.element.offsetLeft;
    
    var fontSize = this.element.getStyle('font-size') || '100%';
    ['em','px','%','pt'].each( function(fontSizeType) {
      if (fontSize.indexOf(fontSizeType)>0) {
        this.fontSize     = parseFloat(fontSize);
        this.fontSizeType = fontSizeType;
      }
    }.bind(this));
    
    this.factor = (this.options.scaleTo - this.options.scaleFrom)/100;
    
    this.dims = null;
    if (this.options.scaleMode=='box')
      this.dims = [this.element.offsetHeight, this.element.offsetWidth];
    if (/^content/.test(this.options.scaleMode))
      this.dims = [this.element.scrollHeight, this.element.scrollWidth];
    if (!this.dims)
      this.dims = [this.options.scaleMode.originalHeight,
                   this.options.scaleMode.originalWidth];
  },
  update: function(position) {
    var currentScale = (this.options.scaleFrom/100.0) + (this.factor * position);
    if (this.options.scaleContent && this.fontSize)
      this.element.setStyle({fontSize: this.fontSize * currentScale + this.fontSizeType });
    this.setDimensions(this.dims[0] * currentScale, this.dims[1] * currentScale);
  },
  finish: function(position) {
    if (this.restoreAfterFinish) this.element.setStyle(this.originalStyle);
  },
  setDimensions: function(height, width) {
    var d = { };
    if (this.options.scaleX) d.width = width.round() + 'px';
    if (this.options.scaleY) d.height = height.round() + 'px';
    if (this.options.scaleFromCenter) {
      var topd  = (height - this.dims[0])/2;
      var leftd = (width  - this.dims[1])/2;
      if (this.elementPositioning == 'absolute') {
        if (this.options.scaleY) d.top = this.originalTop-topd + 'px';
        if (this.options.scaleX) d.left = this.originalLeft-leftd + 'px';
      } else {
        if (this.options.scaleY) d.top = -topd + 'px';
        if (this.options.scaleX) d.left = -leftd + 'px';
      }
    }
    this.element.setStyle(d);
  }
});

Effect.Highlight = Class.create(Effect.Base, {
  initialize: function(element) {
    this.element = $(element);
    if (!this.element) throw(Effect._elementDoesNotExistError);
    var options = Object.extend({ startcolor: '#ffff99' }, arguments[1] || { });
    this.start(options);
  },
  setup: function() {
    // Prevent executing on elements not in the layout flow
    if (this.element.getStyle('display')=='none') { this.cancel(); return; }
    // Disable background image during the effect
    this.oldStyle = { };
    if (!this.options.keepBackgroundImage) {
      this.oldStyle.backgroundImage = this.element.getStyle('background-image');
      this.element.setStyle({backgroundImage: 'none'});
    }
    if (!this.options.endcolor)
      this.options.endcolor = this.element.getStyle('background-color').parseColor('#ffffff');
    if (!this.options.restorecolor)
      this.options.restorecolor = this.element.getStyle('background-color');
    // init color calculations
    this._base  = $R(0,2).map(function(i){ return parseInt(this.options.startcolor.slice(i*2+1,i*2+3),16) }.bind(this));
    this._delta = $R(0,2).map(function(i){ return parseInt(this.options.endcolor.slice(i*2+1,i*2+3),16)-this._base[i] }.bind(this));
  },
  update: function(position) {
    this.element.setStyle({backgroundColor: $R(0,2).inject('#',function(m,v,i){
      return m+((this._base[i]+(this._delta[i]*position)).round().toColorPart()); }.bind(this)) });
  },
  finish: function() {
    this.element.setStyle(Object.extend(this.oldStyle, {
      backgroundColor: this.options.restorecolor
    }));
  }
});

Effect.ScrollTo = function(element) {
  var options = arguments[1] || { },
    scrollOffsets = document.viewport.getScrollOffsets(),
    elementOffsets = $(element).cumulativeOffset(),
    max = (window.height || document.body.scrollHeight) - document.viewport.getHeight();  

  if (options.offset) elementOffsets[1] += options.offset;

  return new Effect.Tween(null,
    scrollOffsets.top,
    elementOffsets[1] > max ? max : elementOffsets[1],
    options,
    function(p){ scrollTo(scrollOffsets.left, p.round()) }
  );
};

/* ------------- combination effects ------------- */

Effect.Fade = function(element) {
  element = $(element);
  var oldOpacity = element.getInlineOpacity();
  var options = Object.extend({
    from: element.getOpacity() || 1.0,
    to:   0.0,
    afterFinishInternal: function(effect) { 
      if (effect.options.to!=0) return;
      effect.element.hide().setStyle({opacity: oldOpacity}); 
    }
  }, arguments[1] || { });
  return new Effect.Opacity(element,options);
};

Effect.Appear = function(element) {
  element = $(element);
  var options = Object.extend({
  from: (element.getStyle('display') == 'none' ? 0.0 : element.getOpacity() || 0.0),
  to:   1.0,
  // force Safari to render floated elements properly
  afterFinishInternal: function(effect) {
    effect.element.forceRerendering();
  },
  beforeSetup: function(effect) {
    effect.element.setOpacity(effect.options.from).show(); 
  }}, arguments[1] || { });
  return new Effect.Opacity(element,options);
};

Effect.Puff = function(element) {
  element = $(element);
  var oldStyle = { 
    opacity: element.getInlineOpacity(), 
    position: element.getStyle('position'),
    top:  element.style.top,
    left: element.style.left,
    width: element.style.width,
    height: element.style.height
  };
  return new Effect.Parallel(
   [ new Effect.Scale(element, 200, 
      { sync: true, scaleFromCenter: true, scaleContent: true, restoreAfterFinish: true }), 
     new Effect.Opacity(element, { sync: true, to: 0.0 } ) ], 
     Object.extend({ duration: 1.0, 
      beforeSetupInternal: function(effect) {
        Position.absolutize(effect.effects[0].element)
      },
      afterFinishInternal: function(effect) {
         effect.effects[0].element.hide().setStyle(oldStyle); }
     }, arguments[1] || { })
   );
};

Effect.BlindUp = function(element) {
  element = $(element);
  element.makeClipping();
  return new Effect.Scale(element, 0,
    Object.extend({ scaleContent: false, 
      scaleX: false, 
      restoreAfterFinish: true,
      afterFinishInternal: function(effect) {
        effect.element.hide().undoClipping();
      } 
    }, arguments[1] || { })
  );
};

Effect.BlindDown = function(element) {
  element = $(element);
  var elementDimensions = element.getDimensions();
  return new Effect.Scale(element, 100, Object.extend({ 
    scaleContent: false, 
    scaleX: false,
    scaleFrom: 0,
    scaleMode: {originalHeight: elementDimensions.height, originalWidth: elementDimensions.width},
    restoreAfterFinish: true,
    afterSetup: function(effect) {
      effect.element.makeClipping().setStyle({height: '0px'}).show(); 
    },  
    afterFinishInternal: function(effect) {
      effect.element.undoClipping();
    }
  }, arguments[1] || { }));
};

Effect.SwitchOff = function(element) {
  element = $(element);
  var oldOpacity = element.getInlineOpacity();
  return new Effect.Appear(element, Object.extend({
    duration: 0.4,
    from: 0,
    transition: Effect.Transitions.flicker,
    afterFinishInternal: function(effect) {
      new Effect.Scale(effect.element, 1, { 
        duration: 0.3, scaleFromCenter: true,
        scaleX: false, scaleContent: false, restoreAfterFinish: true,
        beforeSetup: function(effect) { 
          effect.element.makePositioned().makeClipping();
        },
        afterFinishInternal: function(effect) {
          effect.element.hide().undoClipping().undoPositioned().setStyle({opacity: oldOpacity});
        }
      })
    }
  }, arguments[1] || { }));
};

Effect.DropOut = function(element) {
  element = $(element);
  var oldStyle = {
    top: element.getStyle('top'),
    left: element.getStyle('left'),
    opacity: element.getInlineOpacity() };
  return new Effect.Parallel(
    [ new Effect.Move(element, {x: 0, y: 100, sync: true }), 
      new Effect.Opacity(element, { sync: true, to: 0.0 }) ],
    Object.extend(
      { duration: 0.5,
        beforeSetup: function(effect) {
          effect.effects[0].element.makePositioned(); 
        },
        afterFinishInternal: function(effect) {
          effect.effects[0].element.hide().undoPositioned().setStyle(oldStyle);
        } 
      }, arguments[1] || { }));
};

Effect.Shake = function(element) {
  element = $(element);
  var options = Object.extend({
    distance: 20,
    duration: 0.5
  }, arguments[1] || {});
  var distance = parseFloat(options.distance);
  var split = parseFloat(options.duration) / 10.0;
  var oldStyle = {
    top: element.getStyle('top'),
    left: element.getStyle('left') };
    return new Effect.Move(element,
      { x:  distance, y: 0, duration: split, afterFinishInternal: function(effect) {
    new Effect.Move(effect.element,
      { x: -distance*2, y: 0, duration: split*2,  afterFinishInternal: function(effect) {
    new Effect.Move(effect.element,
      { x:  distance*2, y: 0, duration: split*2,  afterFinishInternal: function(effect) {
    new Effect.Move(effect.element,
      { x: -distance*2, y: 0, duration: split*2,  afterFinishInternal: function(effect) {
    new Effect.Move(effect.element,
      { x:  distance*2, y: 0, duration: split*2,  afterFinishInternal: function(effect) {
    new Effect.Move(effect.element,
      { x: -distance, y: 0, duration: split, afterFinishInternal: function(effect) {
        effect.element.undoPositioned().setStyle(oldStyle);
  }}) }}) }}) }}) }}) }});
};

Effect.SlideDown = function(element) {
  element = $(element).cleanWhitespace();
  // SlideDown need to have the content of the element wrapped in a container element with fixed height!
  var oldInnerBottom = element.down().getStyle('bottom');
  var elementDimensions = element.getDimensions();
  return new Effect.Scale(element, 100, Object.extend({ 
    scaleContent: false, 
    scaleX: false, 
    scaleFrom: window.opera ? 0 : 1,
    scaleMode: {originalHeight: elementDimensions.height, originalWidth: elementDimensions.width},
    restoreAfterFinish: true,
    afterSetup: function(effect) {
      effect.element.makePositioned();
      effect.element.down().makePositioned();
      if (window.opera) effect.element.setStyle({top: ''});
      effect.element.makeClipping().setStyle({height: '0px'}).show(); 
    },
    afterUpdateInternal: function(effect) {
      effect.element.down().setStyle({bottom:
        (effect.dims[0] - effect.element.clientHeight) + 'px' }); 
    },
    afterFinishInternal: function(effect) {
      effect.element.undoClipping().undoPositioned();
      effect.element.down().undoPositioned().setStyle({bottom: oldInnerBottom}); }
    }, arguments[1] || { })
  );
};

Effect.SlideUp = function(element) {
  element = $(element).cleanWhitespace();
  var oldInnerBottom = element.down().getStyle('bottom');
  var elementDimensions = element.getDimensions();
  return new Effect.Scale(element, window.opera ? 0 : 1,
   Object.extend({ scaleContent: false, 
    scaleX: false, 
    scaleMode: 'box',
    scaleFrom: 100,
    scaleMode: {originalHeight: elementDimensions.height, originalWidth: elementDimensions.width},
    restoreAfterFinish: true,
    afterSetup: function(effect) {
      effect.element.makePositioned();
      effect.element.down().makePositioned();
      if (window.opera) effect.element.setStyle({top: ''});
      effect.element.makeClipping().show();
    },  
    afterUpdateInternal: function(effect) {
      effect.element.down().setStyle({bottom:
        (effect.dims[0] - effect.element.clientHeight) + 'px' });
    },
    afterFinishInternal: function(effect) {
      effect.element.hide().undoClipping().undoPositioned();
      effect.element.down().undoPositioned().setStyle({bottom: oldInnerBottom});
    }
   }, arguments[1] || { })
  );
};

// Bug in opera makes the TD containing this element expand for a instance after finish 
Effect.Squish = function(element) {
  return new Effect.Scale(element, window.opera ? 1 : 0, { 
    restoreAfterFinish: true,
    beforeSetup: function(effect) {
      effect.element.makeClipping(); 
    },  
    afterFinishInternal: function(effect) {
      effect.element.hide().undoClipping(); 
    }
  });
};

Effect.Grow = function(element) {
  element = $(element);
  var options = Object.extend({
    direction: 'center',
    moveTransition: Effect.Transitions.sinoidal,
    scaleTransition: Effect.Transitions.sinoidal,
    opacityTransition: Effect.Transitions.full
  }, arguments[1] || { });
  var oldStyle = {
    top: element.style.top,
    left: element.style.left,
    height: element.style.height,
    width: element.style.width,
    opacity: element.getInlineOpacity() };

  var dims = element.getDimensions();    
  var initialMoveX, initialMoveY;
  var moveX, moveY;
  
  switch (options.direction) {
    case 'top-left':
      initialMoveX = initialMoveY = moveX = moveY = 0; 
      break;
    case 'top-right':
      initialMoveX = dims.width;
      initialMoveY = moveY = 0;
      moveX = -dims.width;
      break;
    case 'bottom-left':
      initialMoveX = moveX = 0;
      initialMoveY = dims.height;
      moveY = -dims.height;
      break;
    case 'bottom-right':
      initialMoveX = dims.width;
      initialMoveY = dims.height;
      moveX = -dims.width;
      moveY = -dims.height;
      break;
    case 'center':
      initialMoveX = dims.width / 2;
      initialMoveY = dims.height / 2;
      moveX = -dims.width / 2;
      moveY = -dims.height / 2;
      break;
  }
  
  return new Effect.Move(element, {
    x: initialMoveX,
    y: initialMoveY,
    duration: 0.01, 
    beforeSetup: function(effect) {
      effect.element.hide().makeClipping().makePositioned();
    },
    afterFinishInternal: function(effect) {
      new Effect.Parallel(
        [ new Effect.Opacity(effect.element, { sync: true, to: 1.0, from: 0.0, transition: options.opacityTransition }),
          new Effect.Move(effect.element, { x: moveX, y: moveY, sync: true, transition: options.moveTransition }),
          new Effect.Scale(effect.element, 100, {
            scaleMode: { originalHeight: dims.height, originalWidth: dims.width }, 
            sync: true, scaleFrom: window.opera ? 1 : 0, transition: options.scaleTransition, restoreAfterFinish: true})
        ], Object.extend({
             beforeSetup: function(effect) {
               effect.effects[0].element.setStyle({height: '0px'}).show(); 
             },
             afterFinishInternal: function(effect) {
               effect.effects[0].element.undoClipping().undoPositioned().setStyle(oldStyle); 
             }
           }, options)
      )
    }
  });
};

Effect.Shrink = function(element) {
  element = $(element);
  var options = Object.extend({
    direction: 'center',
    moveTransition: Effect.Transitions.sinoidal,
    scaleTransition: Effect.Transitions.sinoidal,
    opacityTransition: Effect.Transitions.none
  }, arguments[1] || { });
  var oldStyle = {
    top: element.style.top,
    left: element.style.left,
    height: element.style.height,
    width: element.style.width,
    opacity: element.getInlineOpacity() };

  var dims = element.getDimensions();
  var moveX, moveY;
  
  switch (options.direction) {
    case 'top-left':
      moveX = moveY = 0;
      break;
    case 'top-right':
      moveX = dims.width;
      moveY = 0;
      break;
    case 'bottom-left':
      moveX = 0;
      moveY = dims.height;
      break;
    case 'bottom-right':
      moveX = dims.width;
      moveY = dims.height;
      break;
    case 'center':  
      moveX = dims.width / 2;
      moveY = dims.height / 2;
      break;
  }
  
  return new Effect.Parallel(
    [ new Effect.Opacity(element, { sync: true, to: 0.0, from: 1.0, transition: options.opacityTransition }),
      new Effect.Scale(element, window.opera ? 1 : 0, { sync: true, transition: options.scaleTransition, restoreAfterFinish: true}),
      new Effect.Move(element, { x: moveX, y: moveY, sync: true, transition: options.moveTransition })
    ], Object.extend({            
         beforeStartInternal: function(effect) {
           effect.effects[0].element.makePositioned().makeClipping(); 
         },
         afterFinishInternal: function(effect) {
           effect.effects[0].element.hide().undoClipping().undoPositioned().setStyle(oldStyle); }
       }, options)
  );
};

Effect.Pulsate = function(element) {
  element = $(element);
  var options    = arguments[1] || { };
  var oldOpacity = element.getInlineOpacity();
  var transition = options.transition || Effect.Transitions.sinoidal;
  var reverser   = function(pos){ return transition(1-Effect.Transitions.pulse(pos, options.pulses)) };
  reverser.bind(transition);
  return new Effect.Opacity(element, 
    Object.extend(Object.extend({  duration: 2.0, from: 0,
      afterFinishInternal: function(effect) { effect.element.setStyle({opacity: oldOpacity}); }
    }, options), {transition: reverser}));
};

Effect.Fold = function(element) {
  element = $(element);
  var oldStyle = {
    top: element.style.top,
    left: element.style.left,
    width: element.style.width,
    height: element.style.height };
  element.makeClipping();
  return new Effect.Scale(element, 5, Object.extend({   
    scaleContent: false,
    scaleX: false,
    afterFinishInternal: function(effect) {
    new Effect.Scale(element, 1, { 
      scaleContent: false, 
      scaleY: false,
      afterFinishInternal: function(effect) {
        effect.element.hide().undoClipping().setStyle(oldStyle);
      } });
  }}, arguments[1] || { }));
};

Effect.Morph = Class.create(Effect.Base, {
  initialize: function(element) {
    this.element = $(element);
    if (!this.element) throw(Effect._elementDoesNotExistError);
    var options = Object.extend({
      style: { }
    }, arguments[1] || { });
    
    if (!Object.isString(options.style)) this.style = $H(options.style);
    else {
      if (options.style.include(':'))
        this.style = options.style.parseStyle();
      else {
        this.element.addClassName(options.style);
        this.style = $H(this.element.getStyles());
        this.element.removeClassName(options.style);
        var css = this.element.getStyles();
        this.style = this.style.reject(function(style) {
          return style.value == css[style.key];
        });
        options.afterFinishInternal = function(effect) {
          effect.element.addClassName(effect.options.style);
          effect.transforms.each(function(transform) {
            effect.element.style[transform.style] = '';
          });
        }
      }
    }
    this.start(options);
  },
  
  setup: function(){
    function parseColor(color){
      if (!color || ['rgba(0, 0, 0, 0)','transparent'].include(color)) color = '#ffffff';
      color = color.parseColor();
      return $R(0,2).map(function(i){
        return parseInt( color.slice(i*2+1,i*2+3), 16 ) 
      });
    }
    this.transforms = this.style.map(function(pair){
      var property = pair[0], value = pair[1], unit = null;

      if (value.parseColor('#zzzzzz') != '#zzzzzz') {
        value = value.parseColor();
        unit  = 'color';
      } else if (property == 'opacity') {
        value = parseFloat(value);
        if (Prototype.Browser.IE && (!this.element.currentStyle.hasLayout))
          this.element.setStyle({zoom: 1});
      } else if (Element.CSS_LENGTH.test(value)) {
          var components = value.match(/^([\+\-]?[0-9\.]+)(.*)$/);
          value = parseFloat(components[1]);
          unit = (components.length == 3) ? components[2] : null;
      }

      var originalValue = this.element.getStyle(property);
      return { 
        style: property.camelize(), 
        originalValue: unit=='color' ? parseColor(originalValue) : parseFloat(originalValue || 0), 
        targetValue: unit=='color' ? parseColor(value) : value,
        unit: unit
      };
    }.bind(this)).reject(function(transform){
      return (
        (transform.originalValue == transform.targetValue) ||
        (
          transform.unit != 'color' &&
          (isNaN(transform.originalValue) || isNaN(transform.targetValue))
        )
      )
    });
  },
  update: function(position) {
    var style = { }, transform, i = this.transforms.length;
    while(i--)
      style[(transform = this.transforms[i]).style] = 
        transform.unit=='color' ? '#'+
          (Math.round(transform.originalValue[0]+
            (transform.targetValue[0]-transform.originalValue[0])*position)).toColorPart() +
          (Math.round(transform.originalValue[1]+
            (transform.targetValue[1]-transform.originalValue[1])*position)).toColorPart() +
          (Math.round(transform.originalValue[2]+
            (transform.targetValue[2]-transform.originalValue[2])*position)).toColorPart() :
        (transform.originalValue +
          (transform.targetValue - transform.originalValue) * position).toFixed(3) + 
            (transform.unit === null ? '' : transform.unit);
    this.element.setStyle(style, true);
  }
});

Effect.Transform = Class.create({
  initialize: function(tracks){
    this.tracks  = [];
    this.options = arguments[1] || { };
    this.addTracks(tracks);
  },
  addTracks: function(tracks){
    tracks.each(function(track){
      track = $H(track);
      var data = track.values().first();
      this.tracks.push($H({
        ids:     track.keys().first(),
        effect:  Effect.Morph,
        options: { style: data }
      }));
    }.bind(this));
    return this;
  },
  play: function(){
    return new Effect.Parallel(
      this.tracks.map(function(track){
        var ids = track.get('ids'), effect = track.get('effect'), options = track.get('options');
        var elements = [$(ids) || $$(ids)].flatten();
        return elements.map(function(e){ return new effect(e, Object.extend({ sync:true }, options)) });
      }).flatten(),
      this.options
    );
  }
});

Element.CSS_PROPERTIES = $w(
  'backgroundColor backgroundPosition borderBottomColor borderBottomStyle ' + 
  'borderBottomWidth borderLeftColor borderLeftStyle borderLeftWidth ' +
  'borderRightColor borderRightStyle borderRightWidth borderSpacing ' +
  'borderTopColor borderTopStyle borderTopWidth bottom clip color ' +
  'fontSize fontWeight height left letterSpacing lineHeight ' +
  'marginBottom marginLeft marginRight marginTop markerOffset maxHeight '+
  'maxWidth minHeight minWidth opacity outlineColor outlineOffset ' +
  'outlineWidth paddingBottom paddingLeft paddingRight paddingTop ' +
  'right textIndent top width wordSpacing zIndex');
  
Element.CSS_LENGTH = /^(([\+\-]?[0-9\.]+)(em|ex|px|in|cm|mm|pt|pc|\%))|0$/;

String.__parseStyleElement = document.createElement('div');
String.prototype.parseStyle = function(){
  var style, styleRules = $H();
  if (Prototype.Browser.WebKit)
    style = new Element('div',{style:this}).style;
  else {
    String.__parseStyleElement.innerHTML = '<div style="' + this + '"></div>';
    style = String.__parseStyleElement.childNodes[0].style;
  }
  
  Element.CSS_PROPERTIES.each(function(property){
    if (style[property]) styleRules.set(property, style[property]); 
  });
  
  if (Prototype.Browser.IE && this.include('opacity'))
    styleRules.set('opacity', this.match(/opacity:\s*((?:0|1)?(?:\.\d*)?)/)[1]);

  return styleRules;
};

if (document.defaultView && document.defaultView.getComputedStyle) {
  Element.getStyles = function(element) {
    var css = document.defaultView.getComputedStyle($(element), null);
    return Element.CSS_PROPERTIES.inject({ }, function(styles, property) {
      styles[property] = css[property];
      return styles;
    });
  };
} else {
  Element.getStyles = function(element) {
    element = $(element);
    var css = element.currentStyle, styles;
    styles = Element.CSS_PROPERTIES.inject({ }, function(hash, property) {
      hash.set(property, css[property]);
      return hash;
    });
    if (!styles.opacity) styles.set('opacity', element.getOpacity());
    return styles;
  };
};

Effect.Methods = {
  morph: function(element, style) {
    element = $(element);
    new Effect.Morph(element, Object.extend({ style: style }, arguments[2] || { }));
    return element;
  },
  visualEffect: function(element, effect, options) {
    element = $(element)
    var s = effect.dasherize().camelize(), klass = s.charAt(0).toUpperCase() + s.substring(1);
    new Effect[klass](element, options);
    return element;
  },
  highlight: function(element, options) {
    element = $(element);
    new Effect.Highlight(element, options);
    return element;
  }
};

$w('fade appear grow shrink fold blindUp blindDown slideUp slideDown '+
  'pulsate shake puff squish switchOff dropOut').each(
  function(effect) { 
    Effect.Methods[effect] = function(element, options){
      element = $(element);
      Effect[effect.charAt(0).toUpperCase() + effect.substring(1)](element, options);
      return element;
    }
  }
);

$w('getInlineOpacity forceRerendering setContentZoom collectTextNodes collectTextNodesIgnoreClass getStyles').each( 
  function(f) { Effect.Methods[f] = Element[f]; }
);

Element.addMethods(Effect.Methods);


// Copyright (c) 2005-2007 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
//           (c) 2005-2007 Sammi Williams (http://www.oriontransfer.co.nz, sammi@oriontransfer.co.nz)
// 
// script.aculo.us is freely distributable under the terms of an MIT-style license.
// For details, see the script.aculo.us web site: http://script.aculo.us/

if(Object.isUndefined(Effect))
  throw("dragdrop.js requires including script.aculo.us' effects.js library");

var Droppables = {
  drops: [],

  remove: function(element) {
    this.drops = this.drops.reject(function(d) { return d.element==$(element) });
  },

  add: function(element) {
    element = $(element);
    var options = Object.extend({
      greedy:     true,
      hoverclass: null,
      tree:       false
    }, arguments[1] || { });

    // cache containers
    if(options.containment) {
      options._containers = [];
      var containment = options.containment;
      if(Object.isArray(containment)) {
        containment.each( function(c) { options._containers.push($(c)) });
      } else {
        options._containers.push($(containment));
      }
    }
    
    if(options.accept) options.accept = [options.accept].flatten();

    Element.makePositioned(element); // fix IE
    options.element = element;

    this.drops.push(options);
  },
  
  findDeepestChild: function(drops) {
    deepest = drops[0];
      
    for (i = 1; i < drops.length; ++i)
      if (Element.isParent(drops[i].element, deepest.element))
        deepest = drops[i];
    
    return deepest;
  },

  isContained: function(element, drop) {
    var containmentNode;
    if(drop.tree) {
      containmentNode = element.treeNode; 
    } else {
      containmentNode = element.parentNode;
    }
    return drop._containers.detect(function(c) { return containmentNode == c });
  },
  
  isAffected: function(point, element, drop) {
    return (
      (drop.element!=element) &&
      ((!drop._containers) ||
        this.isContained(element, drop)) &&
      ((!drop.accept) ||
        (Element.classNames(element).detect( 
          function(v) { return drop.accept.include(v) } ) )) &&
      Position.within(drop.element, point[0], point[1]) );
  },

  deactivate: function(drop) {
    if(drop.hoverclass)
      Element.removeClassName(drop.element, drop.hoverclass);
    this.last_active = null;
  },

  activate: function(drop) {
    if(drop.hoverclass)
      Element.addClassName(drop.element, drop.hoverclass);
    this.last_active = drop;
  },

  show: function(point, element) {
    if(!this.drops.length) return;
    var drop, affected = [];
    
    this.drops.each( function(drop) {
      if(Droppables.isAffected(point, element, drop))
        affected.push(drop);
    });
        
    if(affected.length>0)
      drop = Droppables.findDeepestChild(affected);

    if(this.last_active && this.last_active != drop) this.deactivate(this.last_active);
    if (drop) {
      Position.within(drop.element, point[0], point[1]);
      if(drop.onHover)
        drop.onHover(element, drop.element, Position.overlap(drop.overlap, drop.element));
      
      if (drop != this.last_active) Droppables.activate(drop);
    }
  },

  fire: function(event, element) {
    if(!this.last_active) return;
    Position.prepare();

    if (this.isAffected([Event.pointerX(event), Event.pointerY(event)], element, this.last_active))
      if (this.last_active.onDrop) {
        this.last_active.onDrop(element, this.last_active.element, event); 
        return true; 
      }
  },

  reset: function() {
    if(this.last_active)
      this.deactivate(this.last_active);
  }
}

var Draggables = {
  drags: [],
  observers: [],
  
  register: function(draggable) {
    if(this.drags.length == 0) {
      this.eventMouseUp   = this.endDrag.bindAsEventListener(this);
      this.eventMouseMove = this.updateDrag.bindAsEventListener(this);
      this.eventKeypress  = this.keyPress.bindAsEventListener(this);
      
      Event.observe(document, "mouseup", this.eventMouseUp);
      Event.observe(document, "mousemove", this.eventMouseMove);
      Event.observe(document, "keypress", this.eventKeypress);
    }
    this.drags.push(draggable);
  },
  
  unregister: function(draggable) {
    this.drags = this.drags.reject(function(d) { return d==draggable });
    if(this.drags.length == 0) {
      Event.stopObserving(document, "mouseup", this.eventMouseUp);
      Event.stopObserving(document, "mousemove", this.eventMouseMove);
      Event.stopObserving(document, "keypress", this.eventKeypress);
    }
  },
  
  activate: function(draggable) {
    if(draggable.options.delay) { 
      this._timeout = setTimeout(function() { 
        Draggables._timeout = null; 
        window.focus(); 
        Draggables.activeDraggable = draggable; 
      }.bind(this), draggable.options.delay); 
    } else {
      window.focus(); // allows keypress events if window isn't currently focused, fails for Safari
      this.activeDraggable = draggable;
    }
  },
  
  deactivate: function() {
    this.activeDraggable = null;
  },
  
  updateDrag: function(event) {
    if(!this.activeDraggable) return;
    var pointer = [Event.pointerX(event), Event.pointerY(event)];
    // Mozilla-based browsers fire successive mousemove events with
    // the same coordinates, prevent needless redrawing (moz bug?)
    if(this._lastPointer && (this._lastPointer.inspect() == pointer.inspect())) return;
    this._lastPointer = pointer;
    
    this.activeDraggable.updateDrag(event, pointer);
  },
  
  endDrag: function(event) {
    if(this._timeout) { 
      clearTimeout(this._timeout); 
      this._timeout = null; 
    }
    if(!this.activeDraggable) return;
    this._lastPointer = null;
    this.activeDraggable.endDrag(event);
    this.activeDraggable = null;
  },
  
  keyPress: function(event) {
    if(this.activeDraggable)
      this.activeDraggable.keyPress(event);
  },
  
  addObserver: function(observer) {
    this.observers.push(observer);
    this._cacheObserverCallbacks();
  },
  
  removeObserver: function(element) {  // element instead of observer fixes mem leaks
    this.observers = this.observers.reject( function(o) { return o.element==element });
    this._cacheObserverCallbacks();
  },
  
  notify: function(eventName, draggable, event) {  // 'onStart', 'onEnd', 'onDrag'
    if(this[eventName+'Count'] > 0)
      this.observers.each( function(o) {
        if(o[eventName]) o[eventName](eventName, draggable, event);
      });
    if(draggable.options[eventName]) draggable.options[eventName](draggable, event);
  },
  
  _cacheObserverCallbacks: function() {
    ['onStart','onEnd','onDrag'].each( function(eventName) {
      Draggables[eventName+'Count'] = Draggables.observers.select(
        function(o) { return o[eventName]; }
      ).length;
    });
  }
}

/*--------------------------------------------------------------------------*/

var Draggable = Class.create({
  initialize: function(element) {
    var defaults = {
      handle: false,
      reverteffect: function(element, top_offset, left_offset) {
        var dur = Math.sqrt(Math.abs(top_offset^2)+Math.abs(left_offset^2))*0.02;
        new Effect.Move(element, { x: -left_offset, y: -top_offset, duration: dur,
          queue: {scope:'_draggable', position:'end'}
        });
      },
      endeffect: function(element) {
        var toOpacity = Object.isNumber(element._opacity) ? element._opacity : 1.0;
        new Effect.Opacity(element, {duration:0.2, from:0.7, to:toOpacity, 
          queue: {scope:'_draggable', position:'end'},
          afterFinish: function(){ 
            Draggable._dragging[element] = false 
          }
        }); 
      },
      zindex: 1000,
      revert: false,
      quiet: false,
      scroll: false,
      scrollSensitivity: 20,
      scrollSpeed: 15,
      snap: false,  // false, or xy or [x,y] or function(x,y){ return [x,y] }
      delay: 0
    };
    
    if(!arguments[1] || Object.isUndefined(arguments[1].endeffect))
      Object.extend(defaults, {
        starteffect: function(element) {
          element._opacity = Element.getOpacity(element);
          Draggable._dragging[element] = true;
          new Effect.Opacity(element, {duration:0.2, from:element._opacity, to:0.7}); 
        }
      });
    
    var options = Object.extend(defaults, arguments[1] || { });

    this.element = $(element);
    
    if(options.handle && Object.isString(options.handle))
      this.handle = this.element.down('.'+options.handle, 0);
    
    if(!this.handle) this.handle = $(options.handle);
    if(!this.handle) this.handle = this.element;
    
    if(options.scroll && !options.scroll.scrollTo && !options.scroll.outerHTML) {
      options.scroll = $(options.scroll);
      this._isScrollChild = Element.childOf(this.element, options.scroll);
    }

    Element.makePositioned(this.element); // fix IE    

    this.options  = options;
    this.dragging = false;   

    this.eventMouseDown = this.initDrag.bindAsEventListener(this);
    Event.observe(this.handle, "mousedown", this.eventMouseDown);
    
    Draggables.register(this);
  },
  
  destroy: function() {
    Event.stopObserving(this.handle, "mousedown", this.eventMouseDown);
    Draggables.unregister(this);
  },
  
  currentDelta: function() {
    return([
      parseInt(Element.getStyle(this.element,'left') || '0'),
      parseInt(Element.getStyle(this.element,'top') || '0')]);
  },
  
  initDrag: function(event) {
    if(!Object.isUndefined(Draggable._dragging[this.element]) &&
      Draggable._dragging[this.element]) return;
    if(Event.isLeftClick(event)) {    
      // abort on form elements, fixes a Firefox issue
      var src = Event.element(event);
      if((tag_name = src.tagName.toUpperCase()) && (
        tag_name=='INPUT' ||
        tag_name=='SELECT' ||
        tag_name=='OPTION' ||
        tag_name=='BUTTON' ||
        tag_name=='TEXTAREA')) return;
        
      var pointer = [Event.pointerX(event), Event.pointerY(event)];
      var pos     = Position.cumulativeOffset(this.element);
      this.offset = [0,1].map( function(i) { return (pointer[i] - pos[i]) });
      
      Draggables.activate(this);
      Event.stop(event);
    }
  },
  
  startDrag: function(event) {
    this.dragging = true;
    if(!this.delta)
      this.delta = this.currentDelta();
    
    if(this.options.zindex) {
      this.originalZ = parseInt(Element.getStyle(this.element,'z-index') || 0);
      this.element.style.zIndex = this.options.zindex;
    }
    
    if(this.options.ghosting) {
      this._clone = this.element.cloneNode(true);
      this.element._originallyAbsolute = (this.element.getStyle('position') == 'absolute');
      if (!this.element._originallyAbsolute)
        Position.absolutize(this.element);
      this.element.parentNode.insertBefore(this._clone, this.element);
    }
    
    if(this.options.scroll) {
      if (this.options.scroll == window) {
        var where = this._getWindowScroll(this.options.scroll);
        this.originalScrollLeft = where.left;
        this.originalScrollTop = where.top;
      } else {
        this.originalScrollLeft = this.options.scroll.scrollLeft;
        this.originalScrollTop = this.options.scroll.scrollTop;
      }
    }
    
    Draggables.notify('onStart', this, event);
        
    if(this.options.starteffect) this.options.starteffect(this.element);
  },
  
  updateDrag: function(event, pointer) {
    if(!this.dragging) this.startDrag(event);
    
    if(!this.options.quiet){
      Position.prepare();
      Droppables.show(pointer, this.element);
    }
    
    Draggables.notify('onDrag', this, event);
    
    this.draw(pointer);
    if(this.options.change) this.options.change(this);
    
    if(this.options.scroll) {
      this.stopScrolling();
      
      var p;
      if (this.options.scroll == window) {
        with(this._getWindowScroll(this.options.scroll)) { p = [ left, top, left+width, top+height ]; }
      } else {
        p = Position.page(this.options.scroll);
        p[0] += this.options.scroll.scrollLeft + Position.deltaX;
        p[1] += this.options.scroll.scrollTop + Position.deltaY;
        p.push(p[0]+this.options.scroll.offsetWidth);
        p.push(p[1]+this.options.scroll.offsetHeight);
      }
      var speed = [0,0];
      if(pointer[0] < (p[0]+this.options.scrollSensitivity)) speed[0] = pointer[0]-(p[0]+this.options.scrollSensitivity);
      if(pointer[1] < (p[1]+this.options.scrollSensitivity)) speed[1] = pointer[1]-(p[1]+this.options.scrollSensitivity);
      if(pointer[0] > (p[2]-this.options.scrollSensitivity)) speed[0] = pointer[0]-(p[2]-this.options.scrollSensitivity);
      if(pointer[1] > (p[3]-this.options.scrollSensitivity)) speed[1] = pointer[1]-(p[3]-this.options.scrollSensitivity);
      this.startScrolling(speed);
    }
    
    // fix AppleWebKit rendering
    if(Prototype.Browser.WebKit) window.scrollBy(0,0);
    
    Event.stop(event);
  },
  
  finishDrag: function(event, success) {
    this.dragging = false;
    
    if(this.options.quiet){
      Position.prepare();
      var pointer = [Event.pointerX(event), Event.pointerY(event)];
      Droppables.show(pointer, this.element);
    }

    if(this.options.ghosting) {
      if (!this.element._originallyAbsolute)
        Position.relativize(this.element);
      delete this.element._originallyAbsolute;
      Element.remove(this._clone);
      this._clone = null;
    }

    var dropped = false; 
    if(success) { 
      dropped = Droppables.fire(event, this.element); 
      if (!dropped) dropped = false; 
    }
    if(dropped && this.options.onDropped) this.options.onDropped(this.element);
    Draggables.notify('onEnd', this, event);

    var revert = this.options.revert;
    if(revert && Object.isFunction(revert)) revert = revert(this.element);
    
    var d = this.currentDelta();
    if(revert && this.options.reverteffect) {
      if (dropped == 0 || revert != 'failure')
        this.options.reverteffect(this.element,
          d[1]-this.delta[1], d[0]-this.delta[0]);
    } else {
      this.delta = d;
    }

    if(this.options.zindex)
      this.element.style.zIndex = this.originalZ;

    if(this.options.endeffect) 
      this.options.endeffect(this.element);
      
    Draggables.deactivate(this);
    Droppables.reset();
  },
  
  keyPress: function(event) {
    if(event.keyCode!=Event.KEY_ESC) return;
    this.finishDrag(event, false);
    Event.stop(event);
  },
  
  endDrag: function(event) {
    if(!this.dragging) return;
    this.stopScrolling();
    this.finishDrag(event, true);
    Event.stop(event);
  },
  
  draw: function(point) {
    var pos = Position.cumulativeOffset(this.element);
    if(this.options.ghosting) {
      var r   = Position.realOffset(this.element);
      pos[0] += r[0] - Position.deltaX; pos[1] += r[1] - Position.deltaY;
    }
    
    var d = this.currentDelta();
    pos[0] -= d[0]; pos[1] -= d[1];
    
    if(this.options.scroll && (this.options.scroll != window && this._isScrollChild)) {
      pos[0] -= this.options.scroll.scrollLeft-this.originalScrollLeft;
      pos[1] -= this.options.scroll.scrollTop-this.originalScrollTop;
    }
    
    var p = [0,1].map(function(i){ 
      return (point[i]-pos[i]-this.offset[i]) 
    }.bind(this));
    
    if(this.options.snap) {
      if(Object.isFunction(this.options.snap)) {
        p = this.options.snap(p[0],p[1],this);
      } else {
      if(Object.isArray(this.options.snap)) {
        p = p.map( function(v, i) {
          return (v/this.options.snap[i]).round()*this.options.snap[i] }.bind(this))
      } else {
        p = p.map( function(v) {
          return (v/this.options.snap).round()*this.options.snap }.bind(this))
      }
    }}
    
    var style = this.element.style;
    if((!this.options.constraint) || (this.options.constraint=='horizontal'))
      style.left = p[0] + "px";
    if((!this.options.constraint) || (this.options.constraint=='vertical'))
      style.top  = p[1] + "px";
    
    if(style.visibility=="hidden") style.visibility = ""; // fix gecko rendering
  },
  
  stopScrolling: function() {
    if(this.scrollInterval) {
      clearInterval(this.scrollInterval);
      this.scrollInterval = null;
      Draggables._lastScrollPointer = null;
    }
  },
  
  startScrolling: function(speed) {
    if(!(speed[0] || speed[1])) return;
    this.scrollSpeed = [speed[0]*this.options.scrollSpeed,speed[1]*this.options.scrollSpeed];
    this.lastScrolled = new Date();
    this.scrollInterval = setInterval(this.scroll.bind(this), 10);
  },
  
  scroll: function() {
    var current = new Date();
    var delta = current - this.lastScrolled;
    this.lastScrolled = current;
    if(this.options.scroll == window) {
      with (this._getWindowScroll(this.options.scroll)) {
        if (this.scrollSpeed[0] || this.scrollSpeed[1]) {
          var d = delta / 1000;
          this.options.scroll.scrollTo( left + d*this.scrollSpeed[0], top + d*this.scrollSpeed[1] );
        }
      }
    } else {
      this.options.scroll.scrollLeft += this.scrollSpeed[0] * delta / 1000;
      this.options.scroll.scrollTop  += this.scrollSpeed[1] * delta / 1000;
    }
    
    Position.prepare();
    Droppables.show(Draggables._lastPointer, this.element);
    Draggables.notify('onDrag', this);
    if (this._isScrollChild) {
      Draggables._lastScrollPointer = Draggables._lastScrollPointer || $A(Draggables._lastPointer);
      Draggables._lastScrollPointer[0] += this.scrollSpeed[0] * delta / 1000;
      Draggables._lastScrollPointer[1] += this.scrollSpeed[1] * delta / 1000;
      if (Draggables._lastScrollPointer[0] < 0)
        Draggables._lastScrollPointer[0] = 0;
      if (Draggables._lastScrollPointer[1] < 0)
        Draggables._lastScrollPointer[1] = 0;
      this.draw(Draggables._lastScrollPointer);
    }
    
    if(this.options.change) this.options.change(this);
  },
  
  _getWindowScroll: function(w) {
    var T, L, W, H;
    with (w.document) {
      if (w.document.documentElement && documentElement.scrollTop) {
        T = documentElement.scrollTop;
        L = documentElement.scrollLeft;
      } else if (w.document.body) {
        T = body.scrollTop;
        L = body.scrollLeft;
      }
      if (w.innerWidth) {
        W = w.innerWidth;
        H = w.innerHeight;
      } else if (w.document.documentElement && documentElement.clientWidth) {
        W = documentElement.clientWidth;
        H = documentElement.clientHeight;
      } else {
        W = body.offsetWidth;
        H = body.offsetHeight
      }
    }
    return { top: T, left: L, width: W, height: H };
  }
});

Draggable._dragging = { };

/*--------------------------------------------------------------------------*/

var SortableObserver = Class.create({
  initialize: function(element, observer) {
    this.element   = $(element);
    this.observer  = observer;
    this.lastValue = Sortable.serialize(this.element);
  },
  
  onStart: function() {
    this.lastValue = Sortable.serialize(this.element);
  },
  
  onEnd: function() {
    Sortable.unmark();
    if(this.lastValue != Sortable.serialize(this.element))
      this.observer(this.element)
  }
});

var Sortable = {
  SERIALIZE_RULE: /^[^_\-](?:[A-Za-z0-9\-\_]*)[_](.*)$/,
  
  sortables: { },
  
  _findRootElement: function(element) {
    while (element.tagName.toUpperCase() != "BODY") {  
      if(element.id && Sortable.sortables[element.id]) return element;
      element = element.parentNode;
    }
  },

  options: function(element) {
    element = Sortable._findRootElement($(element));
    if(!element) return;
    return Sortable.sortables[element.id];
  },
  
  destroy: function(element){
    var s = Sortable.options(element);
    
    if(s) {
      Draggables.removeObserver(s.element);
      s.droppables.each(function(d){ Droppables.remove(d) });
      s.draggables.invoke('destroy');
      
      delete Sortable.sortables[s.element.id];
    }
  },

  create: function(element) {
    element = $(element);
    var options = Object.extend({ 
      element:     element,
      tag:         'li',       // assumes li children, override with tag: 'tagname'
      dropOnEmpty: false,
      tree:        false,
      treeTag:     'ul',
      overlap:     'vertical', // one of 'vertical', 'horizontal'
      constraint:  'vertical', // one of 'vertical', 'horizontal', false
      containment: element,    // also takes array of elements (or id's); or false
      handle:      false,      // or a CSS class
      only:        false,
      delay:       0,
      hoverclass:  null,
      ghosting:    false,
      quiet:       false, 
      scroll:      false,
      scrollSensitivity: 20,
      scrollSpeed: 15,
      format:      this.SERIALIZE_RULE,
      
      // these take arrays of elements or ids and can be 
      // used for better initialization performance
      elements:    false,
      handles:     false,
      
      onChange:    Prototype.emptyFunction,
      onUpdate:    Prototype.emptyFunction
    }, arguments[1] || { });

    // clear any old sortable with same element
    this.destroy(element);

    // build options for the draggables
    var options_for_draggable = {
      revert:      true,
      quiet:       options.quiet,
      scroll:      options.scroll,
      scrollSpeed: options.scrollSpeed,
      scrollSensitivity: options.scrollSensitivity,
      delay:       options.delay,
      ghosting:    options.ghosting,
      constraint:  options.constraint,
      handle:      options.handle };

    if(options.starteffect)
      options_for_draggable.starteffect = options.starteffect;

    if(options.reverteffect)
      options_for_draggable.reverteffect = options.reverteffect;
    else
      if(options.ghosting) options_for_draggable.reverteffect = function(element) {
        element.style.top  = 0;
        element.style.left = 0;
      };

    if(options.endeffect)
      options_for_draggable.endeffect = options.endeffect;

    if(options.zindex)
      options_for_draggable.zindex = options.zindex;

    // build options for the droppables  
    var options_for_droppable = {
      overlap:     options.overlap,
      containment: options.containment,
      tree:        options.tree,
      hoverclass:  options.hoverclass,
      onHover:     Sortable.onHover
    }
    
    var options_for_tree = {
      onHover:      Sortable.onEmptyHover,
      overlap:      options.overlap,
      containment:  options.containment,
      hoverclass:   options.hoverclass
    }

    // fix for gecko engine
    Element.cleanWhitespace(element); 

    options.draggables = [];
    options.droppables = [];

    // drop on empty handling
    if(options.dropOnEmpty || options.tree) {
      Droppables.add(element, options_for_tree);
      options.droppables.push(element);
    }

    (options.elements || this.findElements(element, options) || []).each( function(e,i) {
      var handle = options.handles ? $(options.handles[i]) :
        (options.handle ? $(e).select('.' + options.handle)[0] : e); 
      options.draggables.push(
        new Draggable(e, Object.extend(options_for_draggable, { handle: handle })));
      Droppables.add(e, options_for_droppable);
      if(options.tree) e.treeNode = element;
      options.droppables.push(e);      
    });
    
    if(options.tree) {
      (Sortable.findTreeElements(element, options) || []).each( function(e) {
        Droppables.add(e, options_for_tree);
        e.treeNode = element;
        options.droppables.push(e);
      });
    }

    // keep reference
    this.sortables[element.id] = options;

    // for onupdate
    Draggables.addObserver(new SortableObserver(element, options.onUpdate));

  },

  // return all suitable-for-sortable elements in a guaranteed order
  findElements: function(element, options) {
    return Element.findChildren(
      element, options.only, options.tree ? true : false, options.tag);
  },
  
  findTreeElements: function(element, options) {
    return Element.findChildren(
      element, options.only, options.tree ? true : false, options.treeTag);
  },

  onHover: function(element, dropon, overlap) {
    if(Element.isParent(dropon, element)) return;

    if(overlap > .33 && overlap < .66 && Sortable.options(dropon).tree) {
      return;
    } else if(overlap>0.5) {
      Sortable.mark(dropon, 'before');
      if(dropon.previousSibling != element) {
        var oldParentNode = element.parentNode;
        element.style.visibility = "hidden"; // fix gecko rendering
        dropon.parentNode.insertBefore(element, dropon);
        if(dropon.parentNode!=oldParentNode) 
          Sortable.options(oldParentNode).onChange(element);
        Sortable.options(dropon.parentNode).onChange(element);
      }
    } else {
      Sortable.mark(dropon, 'after');
      var nextElement = dropon.nextSibling || null;
      if(nextElement != element) {
        var oldParentNode = element.parentNode;
        element.style.visibility = "hidden"; // fix gecko rendering
        dropon.parentNode.insertBefore(element, nextElement);
        if(dropon.parentNode!=oldParentNode) 
          Sortable.options(oldParentNode).onChange(element);
        Sortable.options(dropon.parentNode).onChange(element);
      }
    }
  },
  
  onEmptyHover: function(element, dropon, overlap) {
    var oldParentNode = element.parentNode;
    var droponOptions = Sortable.options(dropon);
        
    if(!Element.isParent(dropon, element)) {
      var index;
      
      var children = Sortable.findElements(dropon, {tag: droponOptions.tag, only: droponOptions.only});
      var child = null;
            
      if(children) {
        var offset = Element.offsetSize(dropon, droponOptions.overlap) * (1.0 - overlap);
        
        for (index = 0; index < children.length; index += 1) {
          if (offset - Element.offsetSize (children[index], droponOptions.overlap) >= 0) {
            offset -= Element.offsetSize (children[index], droponOptions.overlap);
          } else if (offset - (Element.offsetSize (children[index], droponOptions.overlap) / 2) >= 0) {
            child = index + 1 < children.length ? children[index + 1] : null;
            break;
          } else {
            child = children[index];
            break;
          }
        }
      }
      
      dropon.insertBefore(element, child);
      
      Sortable.options(oldParentNode).onChange(element);
      droponOptions.onChange(element);
    }
  },

  unmark: function() {
    if(Sortable._marker) Sortable._marker.hide();
  },

  mark: function(dropon, position) {
    // mark on ghosting only
    var sortable = Sortable.options(dropon.parentNode);
    if(sortable && !sortable.ghosting) return; 

    if(!Sortable._marker) {
      Sortable._marker = 
        ($('dropmarker') || Element.extend(document.createElement('DIV'))).
          hide().addClassName('dropmarker').setStyle({position:'absolute'});
      document.getElementsByTagName("body").item(0).appendChild(Sortable._marker);
    }    
    var offsets = Position.cumulativeOffset(dropon);
    Sortable._marker.setStyle({left: offsets[0]+'px', top: offsets[1] + 'px'});
    
    if(position=='after')
      if(sortable.overlap == 'horizontal') 
        Sortable._marker.setStyle({left: (offsets[0]+dropon.clientWidth) + 'px'});
      else
        Sortable._marker.setStyle({top: (offsets[1]+dropon.clientHeight) + 'px'});
    
    Sortable._marker.show();
  },
  
  _tree: function(element, options, parent) {
    var children = Sortable.findElements(element, options) || [];
  
    for (var i = 0; i < children.length; ++i) {
      var match = children[i].id.match(options.format);

      if (!match) continue;
      
      var child = {
        id: encodeURIComponent(match ? match[1] : null),
        element: element,
        parent: parent,
        children: [],
        position: parent.children.length,
        container: $(children[i]).down(options.treeTag)
      }
      
      /* Get the element containing the children and recurse over it */
      if (child.container)
        this._tree(child.container, options, child)
      
      parent.children.push (child);
    }

    return parent; 
  },

  tree: function(element) {
    element = $(element);
    var sortableOptions = this.options(element);
    var options = Object.extend({
      tag: sortableOptions.tag,
      treeTag: sortableOptions.treeTag,
      only: sortableOptions.only,
      name: element.id,
      format: sortableOptions.format
    }, arguments[1] || { });
    
    var root = {
      id: null,
      parent: null,
      children: [],
      container: element,
      position: 0
    }
    
    return Sortable._tree(element, options, root);
  },

  /* Construct a [i] index for a particular node */
  _constructIndex: function(node) {
    var index = '';
    do {
      if (node.id) index = '[' + node.position + ']' + index;
    } while ((node = node.parent) != null);
    return index;
  },

  sequence: function(element) {
    element = $(element);
    var options = Object.extend(this.options(element), arguments[1] || { });
    
    return $(this.findElements(element, options) || []).map( function(item) {
      return item.id.match(options.format) ? item.id.match(options.format)[1] : '';
    });
  },

  setSequence: function(element, new_sequence) {
    element = $(element);
    var options = Object.extend(this.options(element), arguments[2] || { });
    
    var nodeMap = { };
    this.findElements(element, options).each( function(n) {
        if (n.id.match(options.format))
            nodeMap[n.id.match(options.format)[1]] = [n, n.parentNode];
        n.parentNode.removeChild(n);
    });
   
    new_sequence.each(function(ident) {
      var n = nodeMap[ident];
      if (n) {
        n[1].appendChild(n[0]);
        delete nodeMap[ident];
      }
    });
  },
  
  serialize: function(element) {
    element = $(element);
    var options = Object.extend(Sortable.options(element), arguments[1] || { });
    var name = encodeURIComponent(
      (arguments[1] && arguments[1].name) ? arguments[1].name : element.id);
    
    if (options.tree) {
      return Sortable.tree(element, arguments[1]).children.map( function (item) {
        return [name + Sortable._constructIndex(item) + "[id]=" + 
                encodeURIComponent(item.id)].concat(item.children.map(arguments.callee));
      }).flatten().join('&');
    } else {
      return Sortable.sequence(element, arguments[1]).map( function(item) {
        return name + "[]=" + encodeURIComponent(item);
      }).join('&');
    }
  }
}

// Returns true if child is contained within element
Element.isParent = function(child, element) {
  if (!child.parentNode || child == element) return false;
  if (child.parentNode == element) return true;
  return Element.isParent(child.parentNode, element);
}

Element.findChildren = function(element, only, recursive, tagName) {   
  if(!element.hasChildNodes()) return null;
  tagName = tagName.toUpperCase();
  if(only) only = [only].flatten();
  var elements = [];
  $A(element.childNodes).each( function(e) {
    if(e.tagName && e.tagName.toUpperCase()==tagName &&
      (!only || (Element.classNames(e).detect(function(v) { return only.include(v) }))))
        elements.push(e);
    if(recursive) {
      var grandchildren = Element.findChildren(e, only, recursive, tagName);
      if(grandchildren) elements.push(grandchildren);
    }
  });

  return (elements.length>0 ? elements.flatten() : []);
}

Element.offsetSize = function (element, type) {
  return element['offset' + ((type=='vertical' || type=='height') ? 'Height' : 'Width')];
}


// Copyright (c) 2005-2007 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
//           (c) 2005-2007 Ivan Krstic (http://blogs.law.harvard.edu/ivan)
//           (c) 2005-2007 Jon Tirsen (http://www.tirsen.com)
// Contributors:
//  Richard Livsey
//  Rahul Bhargava
//  Rob Wills
// 
// script.aculo.us is freely distributable under the terms of an MIT-style license.
// For details, see the script.aculo.us web site: http://script.aculo.us/

// Autocompleter.Base handles all the autocompletion functionality 
// that's independent of the data source for autocompletion. This
// includes drawing the autocompletion menu, observing keyboard
// and mouse events, and similar.
//
// Specific autocompleters need to provide, at the very least, 
// a getUpdatedChoices function that will be invoked every time
// the text inside the monitored textbox changes. This method 
// should get the text for which to provide autocompletion by
// invoking this.getToken(), NOT by directly accessing
// this.element.value. This is to allow incremental tokenized
// autocompletion. Specific auto-completion logic (AJAX, etc)
// belongs in getUpdatedChoices.
//
// Tokenized incremental autocompletion is enabled automatically
// when an autocompleter is instantiated with the 'tokens' option
// in the options parameter, e.g.:
// new Ajax.Autocompleter('id','upd', '/url/', { tokens: ',' });
// will incrementally autocomplete with a comma as the token.
// Additionally, ',' in the above example can be replaced with
// a token array, e.g. { tokens: [',', '\n'] } which
// enables autocompletion on multiple tokens. This is most 
// useful when one of the tokens is \n (a newline), as it 
// allows smart autocompletion after linebreaks.

if(typeof Effect == 'undefined')
  throw("controls.js requires including script.aculo.us' effects.js library");

var Autocompleter = { }
Autocompleter.Base = Class.create({
  baseInitialize: function(element, update, options) {
    element          = $(element)
    this.element     = element; 
    this.update      = $(update);  
    this.hasFocus    = false; 
    this.changed     = false; 
    this.active      = false; 
    this.index       = 0;     
    this.entryCount  = 0;
    this.oldElementValue = this.element.value;

    if(this.setOptions)
      this.setOptions(options);
    else
      this.options = options || { };

    this.options.paramName    = this.options.paramName || this.element.name;
    this.options.tokens       = this.options.tokens || [];
    this.options.frequency    = this.options.frequency || 0.4;
    this.options.minChars     = this.options.minChars || 1;
    this.options.onShow       = this.options.onShow || 
      function(element, update){ 
        if(!update.style.position || update.style.position=='absolute') {
          update.style.position = 'absolute';
          Position.clone(element, update, {
            setHeight: false, 
            offsetTop: element.offsetHeight
          });
        }
        Effect.Appear(update,{duration:0.15});
      };
    this.options.onHide = this.options.onHide || 
      function(element, update){ new Effect.Fade(update,{duration:0.15}) };

    if(typeof(this.options.tokens) == 'string') 
      this.options.tokens = new Array(this.options.tokens);
    // Force carriage returns as token delimiters anyway
    if (!this.options.tokens.include('\n'))
      this.options.tokens.push('\n');

    this.observer = null;
    
    this.element.setAttribute('autocomplete','off');

    Element.hide(this.update);

    Event.observe(this.element, 'blur', this.onBlur.bindAsEventListener(this));
    Event.observe(this.element, 'keydown', this.onKeyPress.bindAsEventListener(this));
  },

  show: function() {
    if(Element.getStyle(this.update, 'display')=='none') this.options.onShow(this.element, this.update);
    if(!this.iefix && 
      (Prototype.Browser.IE) &&
      (Element.getStyle(this.update, 'position')=='absolute')) {
      new Insertion.After(this.update, 
       '<iframe id="' + this.update.id + '_iefix" '+
       'style="display:none;position:absolute;filter:progid:DXImageTransform.Microsoft.Alpha(opacity=0);" ' +
       'src="javascript:false;" frameborder="0" scrolling="no"></iframe>');
      this.iefix = $(this.update.id+'_iefix');
    }
    if(this.iefix) setTimeout(this.fixIEOverlapping.bind(this), 50);
  },
  
  fixIEOverlapping: function() {
    Position.clone(this.update, this.iefix, {setTop:(!this.update.style.height)});
    this.iefix.style.zIndex = 1;
    this.update.style.zIndex = 2;
    Element.show(this.iefix);
  },

  hide: function() {
    this.stopIndicator();
    if(Element.getStyle(this.update, 'display')!='none') this.options.onHide(this.element, this.update);
    if(this.iefix) Element.hide(this.iefix);
  },

  startIndicator: function() {
    if(this.options.indicator) Element.show(this.options.indicator);
  },

  stopIndicator: function() {
    if(this.options.indicator) Element.hide(this.options.indicator);
  },

  onKeyPress: function(event) {
    if(this.active)
      switch(event.keyCode) {
       case Event.KEY_TAB:
       case Event.KEY_RETURN:
         this.selectEntry();
         Event.stop(event);
       case Event.KEY_ESC:
         this.hide();
         this.active = false;
         Event.stop(event);
         return;
       case Event.KEY_LEFT:
       case Event.KEY_RIGHT:
         return;
       case Event.KEY_UP:
         this.markPrevious();
         this.render();
         Event.stop(event);
         return;
       case Event.KEY_DOWN:
         this.markNext();
         this.render();
         Event.stop(event);
         return;
      }
     else 
       if(event.keyCode==Event.KEY_TAB || event.keyCode==Event.KEY_RETURN || 
         (Prototype.Browser.WebKit > 0 && event.keyCode == 0)) return;

    this.changed = true;
    this.hasFocus = true;

    if(this.observer) clearTimeout(this.observer);
      this.observer = 
        setTimeout(this.onObserverEvent.bind(this), this.options.frequency*1000);
  },

  activate: function() {
    this.changed = false;
    this.hasFocus = true;
    this.getUpdatedChoices();
  },

  onHover: function(event) {
    var element = Event.findElement(event, 'LI');
    if(this.index != element.autocompleteIndex) 
    {
        this.index = element.autocompleteIndex;
        this.render();
    }
    Event.stop(event);
  },
  
  onClick: function(event) {
    var element = Event.findElement(event, 'LI');
    this.index = element.autocompleteIndex;
    this.selectEntry();
    this.hide();
  },
  
  onBlur: function(event) {
    // needed to make click events working
    setTimeout(this.hide.bind(this), 250);
    this.hasFocus = false;
    this.active = false;     
  }, 
  
  render: function() {
    if(this.entryCount > 0) {
      for (var i = 0; i < this.entryCount; i++)
        this.index==i ? 
          Element.addClassName(this.getEntry(i),"selected") : 
          Element.removeClassName(this.getEntry(i),"selected");
      if(this.hasFocus) { 
        this.show();
        this.active = true;
      }
    } else {
      this.active = false;
      this.hide();
    }
  },
  
  markPrevious: function() {
    if(this.index > 0) this.index--
      else this.index = this.entryCount-1;
    this.getEntry(this.index).scrollIntoView(true);
  },
  
  markNext: function() {
    if(this.index < this.entryCount-1) this.index++
      else this.index = 0;
    this.getEntry(this.index).scrollIntoView(false);
  },
  
  getEntry: function(index) {
    return this.update.firstChild.childNodes[index];
  },
  
  getCurrentEntry: function() {
    return this.getEntry(this.index);
  },
  
  selectEntry: function() {
    this.active = false;
    this.updateElement(this.getCurrentEntry());
  },

  updateElement: function(selectedElement) {
    if (this.options.updateElement) {
      this.options.updateElement(selectedElement);
      return;
    }
    var value = '';
    if (this.options.select) {
      var nodes = $(selectedElement).select('.' + this.options.select) || [];
      if(nodes.length>0) value = Element.collectTextNodes(nodes[0], this.options.select);
    } else
      value = Element.collectTextNodesIgnoreClass(selectedElement, 'informal');
    
    var bounds = this.getTokenBounds();
    if (bounds[0] != -1) {
      var newValue = this.element.value.substr(0, bounds[0]);
      var whitespace = this.element.value.substr(bounds[0]).match(/^\s+/);
      if (whitespace)
        newValue += whitespace[0];
      this.element.value = newValue + value + this.element.value.substr(bounds[1]);
    } else {
      this.element.value = value;
    }
    this.oldElementValue = this.element.value;
    this.element.focus();
    
    if (this.options.afterUpdateElement)
      this.options.afterUpdateElement(this.element, selectedElement);
  },

  updateChoices: function(choices) {
    if(!this.changed && this.hasFocus) {
      this.update.innerHTML = choices;
      Element.cleanWhitespace(this.update);
      Element.cleanWhitespace(this.update.down());

      if(this.update.firstChild && this.update.down().childNodes) {
        this.entryCount = 
          this.update.down().childNodes.length;
        for (var i = 0; i < this.entryCount; i++) {
          var entry = this.getEntry(i);
          entry.autocompleteIndex = i;
          this.addObservers(entry);
        }
      } else { 
        this.entryCount = 0;
      }

      this.stopIndicator();
      this.index = 0;
      
      if(this.entryCount==1 && this.options.autoSelect) {
        this.selectEntry();
        this.hide();
      } else {
        this.render();
      }
    }
  },

  addObservers: function(element) {
    Event.observe(element, "mouseover", this.onHover.bindAsEventListener(this));
    Event.observe(element, "click", this.onClick.bindAsEventListener(this));
  },

  onObserverEvent: function() {
    this.changed = false;   
    this.tokenBounds = null;
    if(this.getToken().length>=this.options.minChars) {
      this.getUpdatedChoices();
    } else {
      this.active = false;
      this.hide();
    }
    this.oldElementValue = this.element.value;
  },

  getToken: function() {
    var bounds = this.getTokenBounds();
    return this.element.value.substring(bounds[0], bounds[1]).strip();
  },

  getTokenBounds: function() {
    if (null != this.tokenBounds) return this.tokenBounds;
    var value = this.element.value;
    if (value.strip().empty()) return [-1, 0];
    var diff = arguments.callee.getFirstDifferencePos(value, this.oldElementValue);
    var offset = (diff == this.oldElementValue.length ? 1 : 0);
    var prevTokenPos = -1, nextTokenPos = value.length;
    var tp;
    for (var index = 0, l = this.options.tokens.length; index < l; ++index) {
      tp = value.lastIndexOf(this.options.tokens[index], diff + offset - 1);
      if (tp > prevTokenPos) prevTokenPos = tp;
      tp = value.indexOf(this.options.tokens[index], diff + offset);
      if (-1 != tp && tp < nextTokenPos) nextTokenPos = tp;
    }
    return (this.tokenBounds = [prevTokenPos + 1, nextTokenPos]);
  }
});

Autocompleter.Base.prototype.getTokenBounds.getFirstDifferencePos = function(newS, oldS) {
  var boundary = Math.min(newS.length, oldS.length);
  for (var index = 0; index < boundary; ++index)
    if (newS[index] != oldS[index])
      return index;
  return boundary;
};

Ajax.Autocompleter = Class.create(Autocompleter.Base, {
  initialize: function(element, update, url, options) {
    this.baseInitialize(element, update, options);
    this.options.asynchronous  = true;
    this.options.onComplete    = this.onComplete.bind(this);
    this.options.defaultParams = this.options.parameters || null;
    this.url                   = url;
  },

  getUpdatedChoices: function() {
    this.startIndicator();
    
    var entry = encodeURIComponent(this.options.paramName) + '=' + 
      encodeURIComponent(this.getToken());

    this.options.parameters = this.options.callback ?
      this.options.callback(this.element, entry) : entry;

    if(this.options.defaultParams) 
      this.options.parameters += '&' + this.options.defaultParams;
    
    new Ajax.Request(this.url, this.options);
  },

  onComplete: function(request) {
    this.updateChoices(request.responseText);
  }
});

// The local array autocompleter. Used when you'd prefer to
// inject an array of autocompletion options into the page, rather
// than sending out Ajax queries, which can be quite slow sometimes.
//
// The constructor takes four parameters. The first two are, as usual,
// the id of the monitored textbox, and id of the autocompletion menu.
// The third is the array you want to autocomplete from, and the fourth
// is the options block.
//
// Extra local autocompletion options:
// - choices - How many autocompletion choices to offer
//
// - partialSearch - If false, the autocompleter will match entered
//                    text only at the beginning of strings in the 
//                    autocomplete array. Defaults to true, which will
//                    match text at the beginning of any *word* in the
//                    strings in the autocomplete array. If you want to
//                    search anywhere in the string, additionally set
//                    the option fullSearch to true (default: off).
//
// - fullSsearch - Search anywhere in autocomplete array strings.
//
// - partialChars - How many characters to enter before triggering
//                   a partial match (unlike minChars, which defines
//                   how many characters are required to do any match
//                   at all). Defaults to 2.
//
// - ignoreCase - Whether to ignore case when autocompleting.
//                 Defaults to true.
//
// It's possible to pass in a custom function as the 'selector' 
// option, if you prefer to write your own autocompletion logic.
// In that case, the other options above will not apply unless
// you support them.

Autocompleter.Local = Class.create(Autocompleter.Base, {
  initialize: function(element, update, array, options) {
    this.baseInitialize(element, update, options);
    this.options.array = array;
  },

  getUpdatedChoices: function() {
    this.updateChoices(this.options.selector(this));
  },

  setOptions: function(options) {
    this.options = Object.extend({
      choices: 10,
      partialSearch: true,
      partialChars: 2,
      ignoreCase: true,
      fullSearch: false,
      selector: function(instance) {
        var ret       = []; // Beginning matches
        var partial   = []; // Inside matches
        var entry     = instance.getToken();
        var count     = 0;

        for (var i = 0; i < instance.options.array.length &&  
          ret.length < instance.options.choices ; i++) { 

          var elem = instance.options.array[i];
          var foundPos = instance.options.ignoreCase ? 
            elem.toLowerCase().indexOf(entry.toLowerCase()) : 
            elem.indexOf(entry);

          while (foundPos != -1) {
            if (foundPos == 0 && elem.length != entry.length) { 
              ret.push("<li><strong>" + elem.substr(0, entry.length) + "</strong>" + 
                elem.substr(entry.length) + "</li>");
              break;
            } else if (entry.length >= instance.options.partialChars && 
              instance.options.partialSearch && foundPos != -1) {
              if (instance.options.fullSearch || /\s/.test(elem.substr(foundPos-1,1))) {
                partial.push("<li>" + elem.substr(0, foundPos) + "<strong>" +
                  elem.substr(foundPos, entry.length) + "</strong>" + elem.substr(
                  foundPos + entry.length) + "</li>");
                break;
              }
            }

            foundPos = instance.options.ignoreCase ? 
              elem.toLowerCase().indexOf(entry.toLowerCase(), foundPos + 1) : 
              elem.indexOf(entry, foundPos + 1);

          }
        }
        if (partial.length)
          ret = ret.concat(partial.slice(0, instance.options.choices - ret.length))
        return "<ul>" + ret.join('') + "</ul>";
      }
    }, options || { });
  }
});

// AJAX in-place editor and collection editor
// Full rewrite by Christophe Porteneuve <tdd@tddsworld.com> (April 2007).

// Use this if you notice weird scrolling problems on some browsers,
// the DOM might be a bit confused when this gets called so do this
// waits 1 ms (with setTimeout) until it does the activation
Field.scrollFreeActivate = function(field) {
  setTimeout(function() {
    Field.activate(field);
  }, 1);
}

Ajax.InPlaceEditor = Class.create({
  initialize: function(element, url, options) {
    this.url = url;
    this.element = element = $(element);
    this.prepareOptions();
    this._controls = { };
    arguments.callee.dealWithDeprecatedOptions(options); // DEPRECATION LAYER!!!
    Object.extend(this.options, options || { });
    if (!this.options.formId && this.element.id) {
      this.options.formId = this.element.id + '-inplaceeditor';
      if ($(this.options.formId))
        this.options.formId = '';
    }
    if (this.options.externalControl)
      this.options.externalControl = $(this.options.externalControl);
    if (!this.options.externalControl)
      this.options.externalControlOnly = false;
    this._originalBackground = this.element.getStyle('background-color') || 'transparent';
    this.element.title = this.options.clickToEditText;
    this._boundCancelHandler = this.handleFormCancellation.bind(this);
    this._boundComplete = (this.options.onComplete || Prototype.emptyFunction).bind(this);
    this._boundFailureHandler = this.handleAJAXFailure.bind(this);
    this._boundSubmitHandler = this.handleFormSubmission.bind(this);
    this._boundWrapperHandler = this.wrapUp.bind(this);
    this.registerListeners();
  },
  checkForEscapeOrReturn: function(e) {
    if (!this._editing || e.ctrlKey || e.altKey || e.shiftKey) return;
    if (Event.KEY_ESC == e.keyCode)
      this.handleFormCancellation(e);
    else if (Event.KEY_RETURN == e.keyCode)
      this.handleFormSubmission(e);
  },
  createControl: function(mode, handler, extraClasses) {
    var control = this.options[mode + 'Control'];
    var text = this.options[mode + 'Text'];
    if ('button' == control) {
      var btn = document.createElement('input');
      btn.type = 'submit';
      btn.value = text;
      btn.className = 'editor_' + mode + '_button';
      if ('cancel' == mode)
        btn.onclick = this._boundCancelHandler;
      this._form.appendChild(btn);
      this._controls[mode] = btn;
    } else if ('link' == control) {
      var link = document.createElement('a');
      link.href = '#';
      link.appendChild(document.createTextNode(text));
      link.onclick = 'cancel' == mode ? this._boundCancelHandler : this._boundSubmitHandler;
      link.className = 'editor_' + mode + '_link';
      if (extraClasses)
        link.className += ' ' + extraClasses;
      this._form.appendChild(link);
      this._controls[mode] = link;
    }
  },
  createEditField: function() {
    var text = (this.options.loadTextURL ? this.options.loadingText : this.getText());
    var fld;
    if (1 >= this.options.rows && !/\r|\n/.test(this.getText())) {
      fld = document.createElement('input');
      fld.type = 'text';
      var size = this.options.size || this.options.cols || 0;
      if (0 < size) fld.size = size;
    } else {
      fld = document.createElement('textarea');
      fld.rows = (1 >= this.options.rows ? this.options.autoRows : this.options.rows);
      fld.cols = this.options.cols || 40;
    }
    fld.name = this.options.paramName;
    fld.value = text; // No HTML breaks conversion anymore
    fld.className = 'editor_field';
    if (this.options.submitOnBlur)
      fld.onblur = this._boundSubmitHandler;
    this._controls.editor = fld;
    if (this.options.loadTextURL)
      this.loadExternalText();
    this._form.appendChild(this._controls.editor);
  },
  createForm: function() {
    var ipe = this;
    function addText(mode, condition) {
      var text = ipe.options['text' + mode + 'Controls'];
      if (!text || condition === false) return;
      ipe._form.appendChild(document.createTextNode(text));
    };
    this._form = $(document.createElement('form'));
    this._form.id = this.options.formId;
    this._form.addClassName(this.options.formClassName);
    this._form.onsubmit = this._boundSubmitHandler;
    this.createEditField();
    if ('textarea' == this._controls.editor.tagName.toLowerCase())
      this._form.appendChild(document.createElement('br'));
    if (this.options.onFormCustomization)
      this.options.onFormCustomization(this, this._form);
    addText('Before', this.options.okControl || this.options.cancelControl);
    this.createControl('ok', this._boundSubmitHandler);
    addText('Between', this.options.okControl && this.options.cancelControl);
    this.createControl('cancel', this._boundCancelHandler, 'editor_cancel');
    addText('After', this.options.okControl || this.options.cancelControl);
  },
  destroy: function() {
    if (this._oldInnerHTML)
      this.element.innerHTML = this._oldInnerHTML;
    this.leaveEditMode();
    this.unregisterListeners();
  },
  enterEditMode: function(e) {
    if (this._saving || this._editing) return;
    this._editing = true;
    this.triggerCallback('onEnterEditMode');
    if (this.options.externalControl)
      this.options.externalControl.hide();
    this.element.hide();
    this.createForm();
    this.element.parentNode.insertBefore(this._form, this.element);
    if (!this.options.loadTextURL)
      this.postProcessEditField();
    if (e) Event.stop(e);
  },
  enterHover: function(e) {
    if (this.options.hoverClassName)
      this.element.addClassName(this.options.hoverClassName);
    if (this._saving) return;
    this.triggerCallback('onEnterHover');
  },
  getText: function() {
    return this.element.innerHTML;
  },
  handleAJAXFailure: function(transport) {
    this.triggerCallback('onFailure', transport);
    if (this._oldInnerHTML) {
      this.element.innerHTML = this._oldInnerHTML;
      this._oldInnerHTML = null;
    }
  },
  handleFormCancellation: function(e) {
    this.wrapUp();
    if (e) Event.stop(e);
  },
  handleFormSubmission: function(e) {
    var form = this._form;
    var value = $F(this._controls.editor);
    this.prepareSubmission();
    var params = this.options.callback(form, value) || '';
    if (Object.isString(params))
      params = params.toQueryParams();
    params.editorId = this.element.id;
    if (this.options.htmlResponse) {
      var options = Object.extend({ evalScripts: true }, this.options.ajaxOptions);
      Object.extend(options, {
        parameters: params,
        onComplete: this._boundWrapperHandler,
        onFailure: this._boundFailureHandler
      });
      new Ajax.Updater({ success: this.element }, this.url, options);
    } else {
      var options = Object.extend({ method: 'get' }, this.options.ajaxOptions);
      Object.extend(options, {
        parameters: params,
        onComplete: this._boundWrapperHandler,
        onFailure: this._boundFailureHandler
      });
      new Ajax.Request(this.url, options);
    }
    if (e) Event.stop(e);
  },
  leaveEditMode: function() {
    this.element.removeClassName(this.options.savingClassName);
    this.removeForm();
    this.leaveHover();
    this.element.style.backgroundColor = this._originalBackground;
    this.element.show();
    if (this.options.externalControl)
      this.options.externalControl.show();
    this._saving = false;
    this._editing = false;
    this._oldInnerHTML = null;
    this.triggerCallback('onLeaveEditMode');
  },
  leaveHover: function(e) {
    if (this.options.hoverClassName)
      this.element.removeClassName(this.options.hoverClassName);
    if (this._saving) return;
    this.triggerCallback('onLeaveHover');
  },
  loadExternalText: function() {
    this._form.addClassName(this.options.loadingClassName);
    this._controls.editor.disabled = true;
    var options = Object.extend({ method: 'get' }, this.options.ajaxOptions);
    Object.extend(options, {
      parameters: 'editorId=' + encodeURIComponent(this.element.id),
      onComplete: Prototype.emptyFunction,
      onSuccess: function(transport) {
        this._form.removeClassName(this.options.loadingClassName);
        var text = transport.responseText;
        if (this.options.stripLoadedTextTags)
          text = text.stripTags();
        this._controls.editor.value = text;
        this._controls.editor.disabled = false;
        this.postProcessEditField();
      }.bind(this),
      onFailure: this._boundFailureHandler
    });
    new Ajax.Request(this.options.loadTextURL, options);
  },
  postProcessEditField: function() {
    var fpc = this.options.fieldPostCreation;
    if (fpc)
      $(this._controls.editor)['focus' == fpc ? 'focus' : 'activate']();
  },
  prepareOptions: function() {
    this.options = Object.clone(Ajax.InPlaceEditor.DefaultOptions);
    Object.extend(this.options, Ajax.InPlaceEditor.DefaultCallbacks);
    [this._extraDefaultOptions].flatten().compact().each(function(defs) {
      Object.extend(this.options, defs);
    }.bind(this));
  },
  prepareSubmission: function() {
    this._saving = true;
    this.removeForm();
    this.leaveHover();
    this.showSaving();
  },
  registerListeners: function() {
    this._listeners = { };
    var listener;
    $H(Ajax.InPlaceEditor.Listeners).each(function(pair) {
      listener = this[pair.value].bind(this);
      this._listeners[pair.key] = listener;
      if (!this.options.externalControlOnly)
        this.element.observe(pair.key, listener);
      if (this.options.externalControl)
        this.options.externalControl.observe(pair.key, listener);
    }.bind(this));
  },
  removeForm: function() {
    if (!this._form) return;
    this._form.remove();
    this._form = null;
    this._controls = { };
  },
  showSaving: function() {
    this._oldInnerHTML = this.element.innerHTML;
    this.element.innerHTML = this.options.savingText;
    this.element.addClassName(this.options.savingClassName);
    this.element.style.backgroundColor = this._originalBackground;
    this.element.show();
  },
  triggerCallback: function(cbName, arg) {
    if ('function' == typeof this.options[cbName]) {
      this.options[cbName](this, arg);
    }
  },
  unregisterListeners: function() {
    $H(this._listeners).each(function(pair) {
      if (!this.options.externalControlOnly)
        this.element.stopObserving(pair.key, pair.value);
      if (this.options.externalControl)
        this.options.externalControl.stopObserving(pair.key, pair.value);
    }.bind(this));
  },
  wrapUp: function(transport) {
    this.leaveEditMode();
    // Can't use triggerCallback due to backward compatibility: requires
    // binding + direct element
    this._boundComplete(transport, this.element);
  }
});

Object.extend(Ajax.InPlaceEditor.prototype, {
  dispose: Ajax.InPlaceEditor.prototype.destroy
});

Ajax.InPlaceCollectionEditor = Class.create(Ajax.InPlaceEditor, {
  initialize: function($super, element, url, options) {
    this._extraDefaultOptions = Ajax.InPlaceCollectionEditor.DefaultOptions;
    $super(element, url, options);
  },

  createEditField: function() {
    var list = document.createElement('select');
    list.name = this.options.paramName;
    list.size = 1;
    this._controls.editor = list;
    this._collection = this.options.collection || [];
    if (this.options.loadCollectionURL)
      this.loadCollection();
    else
      this.checkForExternalText();
    this._form.appendChild(this._controls.editor);
  },

  loadCollection: function() {
    this._form.addClassName(this.options.loadingClassName);
    this.showLoadingText(this.options.loadingCollectionText);
    var options = Object.extend({ method: 'get' }, this.options.ajaxOptions);
    Object.extend(options, {
      parameters: 'editorId=' + encodeURIComponent(this.element.id),
      onComplete: Prototype.emptyFunction,
      onSuccess: function(transport) {
        var js = transport.responseText.strip();
        if (!/^\[.*\]$/.test(js)) // TODO: improve sanity check
          throw 'Server returned an invalid collection representation.';
        this._collection = eval(js);
        this.checkForExternalText();
      }.bind(this),
      onFailure: this.onFailure
    });
    new Ajax.Request(this.options.loadCollectionURL, options);
  },

  showLoadingText: function(text) {
    this._controls.editor.disabled = true;
    var tempOption = this._controls.editor.firstChild;
    if (!tempOption) {
      tempOption = document.createElement('option');
      tempOption.value = '';
      this._controls.editor.appendChild(tempOption);
      tempOption.selected = true;
    }
    tempOption.update((text || '').stripScripts().stripTags());
  },

  checkForExternalText: function() {
    this._text = this.getText();
    if (this.options.loadTextURL)
      this.loadExternalText();
    else
      this.buildOptionList();
  },

  loadExternalText: function() {
    this.showLoadingText(this.options.loadingText);
    var options = Object.extend({ method: 'get' }, this.options.ajaxOptions);
    Object.extend(options, {
      parameters: 'editorId=' + encodeURIComponent(this.element.id),
      onComplete: Prototype.emptyFunction,
      onSuccess: function(transport) {
        this._text = transport.responseText.strip();
        this.buildOptionList();
      }.bind(this),
      onFailure: this.onFailure
    });
    new Ajax.Request(this.options.loadTextURL, options);
  },

  buildOptionList: function() {
    this._form.removeClassName(this.options.loadingClassName);
    this._collection = this._collection.map(function(entry) {
      return 2 === entry.length ? entry : [entry, entry].flatten();
    });
    var marker = ('value' in this.options) ? this.options.value : this._text;
    var textFound = this._collection.any(function(entry) {
      return entry[0] == marker;
    }.bind(this));
    this._controls.editor.update('');
    var option;
    this._collection.each(function(entry, index) {
      option = document.createElement('option');
      option.value = entry[0];
      option.selected = textFound ? entry[0] == marker : 0 == index;
      option.appendChild(document.createTextNode(entry[1]));
      this._controls.editor.appendChild(option);
    }.bind(this));
    this._controls.editor.disabled = false;
    Field.scrollFreeActivate(this._controls.editor);
  }
});

//**** DEPRECATION LAYER FOR InPlace[Collection]Editor! ****
//**** This only  exists for a while,  in order to  let ****
//**** users adapt to  the new API.  Read up on the new ****
//**** API and convert your code to it ASAP!            ****

Ajax.InPlaceEditor.prototype.initialize.dealWithDeprecatedOptions = function(options) {
  if (!options) return;
  function fallback(name, expr) {
    if (name in options || expr === undefined) return;
    options[name] = expr;
  };
  fallback('cancelControl', (options.cancelLink ? 'link' : (options.cancelButton ? 'button' :
    options.cancelLink == options.cancelButton == false ? false : undefined)));
  fallback('okControl', (options.okLink ? 'link' : (options.okButton ? 'button' :
    options.okLink == options.okButton == false ? false : undefined)));
  fallback('highlightColor', options.highlightcolor);
  fallback('highlightEndColor', options.highlightendcolor);
};

Object.extend(Ajax.InPlaceEditor, {
  DefaultOptions: {
    ajaxOptions: { },
    autoRows: 3,                                // Use when multi-line w/ rows == 1
    cancelControl: 'link',                      // 'link'|'button'|false
    cancelText: 'cancel',
    clickToEditText: 'Click to edit',
    externalControl: null,                      // id|elt
    externalControlOnly: false,
    fieldPostCreation: 'activate',              // 'activate'|'focus'|false
    formClassName: 'inplaceeditor-form',
    formId: null,                               // id|elt
    highlightColor: '#ffff99',
    highlightEndColor: '#ffffff',
    hoverClassName: '',
    htmlResponse: true,
    loadingClassName: 'inplaceeditor-loading',
    loadingText: 'Loading...',
    okControl: 'button',                        // 'link'|'button'|false
    okText: 'ok',
    paramName: 'value',
    rows: 1,                                    // If 1 and multi-line, uses autoRows
    savingClassName: 'inplaceeditor-saving',
    savingText: 'Saving...',
    size: 0,
    stripLoadedTextTags: false,
    submitOnBlur: false,
    textAfterControls: '',
    textBeforeControls: '',
    textBetweenControls: ''
  },
  DefaultCallbacks: {
    callback: function(form) {
      return Form.serialize(form);
    },
    onComplete: function(transport, element) {
      // For backward compatibility, this one is bound to the IPE, and passes
      // the element directly.  It was too often customized, so we don't break it.
      new Effect.Highlight(element, {
        startcolor: this.options.highlightColor, keepBackgroundImage: true });
    },
    onEnterEditMode: null,
    onEnterHover: function(ipe) {
      ipe.element.style.backgroundColor = ipe.options.highlightColor;
      if (ipe._effect)
        ipe._effect.cancel();
    },
    onFailure: function(transport, ipe) {
      alert('Error communication with the server: ' + transport.responseText.stripTags());
    },
    onFormCustomization: null, // Takes the IPE and its generated form, after editor, before controls.
    onLeaveEditMode: null,
    onLeaveHover: function(ipe) {
      ipe._effect = new Effect.Highlight(ipe.element, {
        startcolor: ipe.options.highlightColor, endcolor: ipe.options.highlightEndColor,
        restorecolor: ipe._originalBackground, keepBackgroundImage: true
      });
    }
  },
  Listeners: {
    click: 'enterEditMode',
    keydown: 'checkForEscapeOrReturn',
    mouseover: 'enterHover',
    mouseout: 'leaveHover'
  }
});

Ajax.InPlaceCollectionEditor.DefaultOptions = {
  loadingCollectionText: 'Loading options...'
};

// Delayed observer, like Form.Element.Observer, 
// but waits for delay after last key input
// Ideal for live-search fields

Form.Element.DelayedObserver = Class.create({
  initialize: function(element, delay, callback) {
    this.delay     = delay || 0.5;
    this.element   = $(element);
    this.callback  = callback;
    this.timer     = null;
    this.lastValue = $F(this.element); 
    Event.observe(this.element,'keyup',this.delayedListener.bindAsEventListener(this));
  },
  delayedListener: function(event) {
    if(this.lastValue == $F(this.element)) return;
    if(this.timer) clearTimeout(this.timer);
    this.timer = setTimeout(this.onTimerEvent.bind(this), this.delay * 1000);
    this.lastValue = $F(this.element);
  },
  onTimerEvent: function() {
    this.timer = null;
    this.callback(this.element, $F(this.element));
  }
});


// Place your application-specific JavaScript functions and classes here
// This file is automatically included by javascript_include_tag :defaults

// TODO: This file is so generic, it should be refactored out into smaller files with focused names.

function resetmap(themap,center,zoom,bounds)
{
  themap.checkResize(); 
  themap.setCenter(center); 
  if (zoom==-1){
    zoom = (themap.getBoundsZoomLevel(bounds) - 1);    
  }
  if (zoom==0){
    zoom = themap.getBoundsZoomLevel(bounds);    
  }
  themap.setZoom(zoom);
}

function createCookie(name,value,days) {
  if (days) {
    var date = new Date();
    date.setTime(date.getTime()+(days*24*60*60*1000));
    var expires = "; expires="+date.toGMTString();
    delete date;
  }
  else var expires = "";
  document.cookie = name+"="+value+expires+"; path=/";
}

function getCookie(name)
{
	if (document.cookie.length>0) {
		start=document.cookie.indexOf(name + "=");
		if (start!=-1) {
			start=start + name.length+1;
			end=document.cookie.indexOf(";",start);
			if (end==-1) end=document.cookie.length;
			return unescape(document.cookie.substring(start,end));
		}
	}
	return "";
}

function removeCookie(name)
{
  var date = new Date();
  date.setTime ( date.getTime() - 1 );
  var expires = "; expires="+date.toGMTString();
  delete date;
  document.cookie = name+"="+""+expires+"; path=/";
}

function setupTabViews() {
  // plain ".tab_view" <ul>
  $A(document.getElementsByClassName('tab_view')).each(function(tab_selector) {
    new TabView(tab_selector, {
      did_select_tab: function(pane) {
        if (tab_selector.id && tab_selector.id.length > 0) {
          // which pane was selected ?
          var tab_view_id = tab_selector.id.match(/^tab_view_(.*)$/)[1];
          var selected_tab_re = new RegExp("^"+tab_view_id+"_(.*)_pane$");
          var pane_name = pane.id.match(selected_tab_re)[1];  // "menu_page_pane" => "page"

          // store the selected tab_id in a cookie
          createCookie(tab_selector.id, pane_name, 0);
        }
      }
    })
  });
  
  // singleton ".pane_tabs" <ul>
  var tab_selector = document.getElementsByClassName('pane_tabs')[0];
  if (tab_selector) {
    new TabView(tab_selector, {
      did_select_tab: function(pane) {
        // which pane was selected ?
        if (tab_selector.id) {
          var tab_view_id = tab_selector.id.match(/^tab_view_(.*)$/)[1];
          var selected_tab_re = new RegExp("^"+tab_view_id+"_(.*)_pane$");
          var pane_name = pane.id.match(selected_tab_re)[1];  // "menu_page_pane" => "page"

          // store the selected tab_id in a cookie
          createCookie(tab_selector.id, pane_name, 0);

          // give the body the class of the selected pane
          var body = $$('body')[0];
          Element.classNames(body).each(function(class_name) {
            if (class_name.match(/_pane/)) body.removeClassName(class_name);
          })
          body.addClassName(pane_name+'_pane');

          // display relavant controls
          MMT.ImageBrowsers.each(function(image_browser) {
            if (image_browser.element.descendantOf(pane)) {
              image_browser.enable();
            } else {
              image_browser.disable();
            }
          });

          MMT.Photomodules.each(function(photomodule) {
            if (photomodule.element.descendantOf(pane)) {
              photomodule.enable();
            } else {
              photomodule.disable();
            }
          });

          MMT.WidgetEditors.each(function(widget_editor) {
            if (widget_editor.element.descendantOf(pane)) {
              widget_editor.enable();
            } else {
              widget_editor.disable();
            }
          });
        }
      }});
  } else {
    if (!Object.isUndefined(MMT.ImageBrowsers)) {
      MMT.ImageBrowsers.each(function(image_browser) {
        image_browser.enable();
      });
    }
    
    if (!Object.isUndefined(MMT.Photomodules)) {
      MMT.Photomodules.each(function(photomodule) {
        photomodule.enable();
      });
    }
    
    if (!Object.isUndefined(MMT.WidgetEditors)) {
      MMT.WidgetEditors.each(function(widget_editor) {
        widget_editor.enable();
      });
    }
  }
}

function setupSearchField() {
  if (Prototype.Browser.WebKit) {
    var search_field = $('search-text');
    if (search_field) {
      search_field.setAttribute('type', 'search');
      search_field.setAttribute('autosave', 'fotonauts');
      search_field.setAttribute('results', '10');
    }
  }
  var search_form = $('search-form');
  if (search_form) {
    if (Prototype.Browser.WebKit) {
      search_form.removeClassName('decorated');
    }
    search_form.observe('click', function() { // forms can't listen to events in IE
      var search_text = $('search-text');
      if(!search_text || !search_text.hasFocus){
        if(search_form.tagName == 'FORM'){
          Form.focusFirstElement(search_form);
        }else if(search_text){
          search_text.activate();
        }
      }
    });
  }
}

function iframeDocument(selector) {
  var iframe = $$(selector)[0];
  if (!iframe) return null;
  if (iframe.contentDocument)     // Firefox, Opera
    return iframe.contentDocument;
  else if (iframe.contentWindow)  // Internet Explorer
    return iframe.contentWindow.document;
  else if (iframe.document)       // Others?
    return iframe.document;
  return null;
}

function handleViewPortParityBrowsersBug() {
  // Fix horrible FF3/WinIE7/WebKit bug
  // 
  // - <body> has a centered background image, with even width
  // - div#content is a centered div, with even width
  //
  // One could think this background and this div would be displayed aligned.
  // 
  // Alas, FF3/WinIE7/WebKit are unable to handle that properly:
  // they all display them misaligned, depending on the parity of viewport width...
  var body = $$('body')[0];
  if (!(body.hasClassName('widgets_content') || body.hasClassName('embedded'))) {
    if (/Firefox\/3/.test(navigator.userAgent)) {
      body.style.marginRight = '1px';
    } else if (/AppleWebKit\/52[6-8]/.test(navigator.userAgent)) {
      body.style.marginLeft = '1px';
    } else if (Prototype.Browser.IE) {
      body.style.marginLeft = '1px';
    } else if (/AppleWebKit\/53/.test(navigator.userAgent)) {
      body.style.marginLeft = '1px';
    }
  }
}


var _original_onselectstart = null;
// FIXME this method is dangerous if called unbalanced
function enableDocumentTextSelection(enable) {
  if(enable) {
    if (_original_onselectstart) document.onselectstart = _original_onselectstart;
  } else {
    _original_onselectstart = document.onselectstart;
    document.onselectstart = function() { return false; }
  }
}

document.observe('mmt:dom-loaded', function() {
  handleViewPortParityBrowsersBug();
  setupSearchField();
  setupTabViews();
})

function isGettingStartedFormValid(form)
{
  var blank = function(element) {
    return ((element.getValue() + "").replace(/\s+/g,"") == "")
  }
  if (blank($('activation_firstname')) && blank($('activation_lastname'))) {
    alert("Please enter your name!")
    return false
  }
  return true
}

// track a specific event on google analytics 
// this comes in addition to normal page tracking and allows for specific action tracking 
// this will generate an event in analytics as well as optionnally a pageview with a specific path
// 
// Analytics event embed the following information : 
// category (required) : The name you supply for the group of objects you want to track.
// action (required) : A string that is uniquely paired with each category, and commonly used to define the type of user interaction for the web object.
// label (optional) : An optional string to provide additional dimensions to the event data.
// 
// The corresponding pageview will have the following path: 
// /event/category/action/label/path_in_site
// 
// When label is not set, it'll be ommitted in the pageview but replaced by current url path in event
// 
// Call syntax: analyticsTrackEvent(options) 
//  options is a hash containing the following values:
// 
//  category (mandatory)
//  action (mandatory)
//  label (optional)
//
function analyticsTrackEvent(options) 
{
	if (!pageTracker) return; 

	 var pagePath = [ "/event", "/"+options.category, "/"+options.action, (options.label ? "/" + options.label : ""), window.location.pathname].join('');
	 pageTracker._trackPageview(pagePath);
 
	 var eventLabel = (options.label ? options.label : window.location.pathname);
 
	 if (options.value) {
	   pageTracker._trackEvent(options.category, options.action, eventLabel, options.value);
	 } else {
	   pageTracker._trackEvent(options.category, options.action, eventLabel);
	 }
}

function asset_path(path)
{
  return MMT.assets_root_path + path;
}

if (!Element.clone) {
  // taken from http://prototypejs.org/assets/2009/8/31/prototype.js (1.6.1)
  Element.addMethods({
    clone: function(element, deep) {
      if (!(element = $(element))) return;
      var clone = element.cloneNode(deep);
      clone._prototypeUID = void 0;
      if (deep) {
        var descendants = Element.select(clone, '*'),
            i = descendants.length;
        while (i--) {
          descendants[i]._prototypeUID = void 0;
        }
      }
      return Element.extend(clone);
    }
  });
}


MMT.CurrentUser = (function(){
  
  var registrationFormCSSClass = "registrationForm"
  var cachedOauthTokenCookieName = "session_oauth_token"
  
  var options = null
  var overlay = null
  var currentDialog = null
  
  var instance = {}
  var info = null
  var requireLoginCallback = null
  
  
  var createOverlay = function() {
    if (overlay) return
    // may have been created by MMT.ModalDialog already
    overlay = document.getElementById('modal_dialog_overlay')
    if (!overlay) {
      overlay = document.createElement('div')
      overlay.id  = 'modal_dialog_overlay'
      document.getElementsByTagName('body')[0].appendChild(overlay)
    }
  }
  
  // Taken from lightbox implementation found at http://www.huddletogether.com/projects/lightbox/
  var rememberedYPosition
  var storeYPosition = function() {
    if (self.pageYOffset) { // self == window
      rememberedYPosition = self.pageYOffset
    } else if (document.documentElement && document.documentElement.scrollTop){
      rememberedYPosition = document.documentElement.scrollTop
    } else if (document.body) {
      rememberedYPosition = document.body.scrollTop
    }
  }
  var restoreYPosition = function() {
    window.scrollTo(0, rememberedYPosition)
  }
  
  var setHeightAndOverflowForIE = function(height, overflow) {
    var setElementHeightAndOverflow = function(name) {
      var element = document.getElementsByTagName(name)[0]
      element.style.height = height
      element.style.overflow = overflow
    }
    setElementHeightAndOverflow('body')
    setElementHeightAndOverflow('html')
  }
  
  // In IE, select elements hover on top of the lightbox
  var hideSelects = function() {
    var selects = document.getElementsByTagName('select')
    for(i = 0; i < selects.length; i++) {
      selects[i].style.visibility = 'hidden'
    }
  }
  
  // In IE, select elements hover on top of the lightbox
  var showSelects = function(id) {
    var selects
    if (id) {
      selects = $(id).getElementsByTagName('select')
    } else {
      selects = document.getElementsByTagName('select')
    }
    for(i = 0; i < selects.length; i++) {
      selects[i].style.visibility = 'visible'
    }
  }
  
  var fetchOauthTokenRequest = null
  var fetchOauthTokenPendingCallbacks = []
  
  var fetchOauthTokenRequestCallback = function(transport) {
    for (var i = 0; i < fetchOauthTokenPendingCallbacks.length; i++) {
      fetchOauthTokenPendingCallbacks[i](transport.responseText)
    }
    fetchOauthTokenPendingCallbacks = []
    fetchOauthTokenRequest = null
  }
  
  var fetchOauthToken = function(callback) {
    if (!fetchOauthTokenRequest) {
      fetchOauthTokenRequest = new Ajax.Request(
        '/account/oauth_token?random=' + Math.random(),
        {
          method: 'get',
          requestHeaders: { Accept: 'text/html' },  
          onSuccess: fetchOauthTokenRequestCallback
        }
      )
    }
    fetchOauthTokenPendingCallbacks.push(callback)
  }
  
  function createCookie(name, value, seconds) {
    var expires = ""
    
    if (seconds) {
      var date = new Date()
      date.setTime(date.getTime()+(seconds*1000))
      expires = "; expires="+date.toGMTString()
    }
    
    document.cookie = name+"=" + value + expires + "; path=/; domain="+window.location.hostname
  }

  function readCookie(name) {
  	var nameEQ = name + "=";
  	var ca = document.cookie.split(';');
  	for(var i=0;i < ca.length;i++) {
  		var c = ca[i];
  		while (c.charAt(0)==' ') c = c.substring(1,c.length);
  		if (c.indexOf(nameEQ) == 0) {
  	    var cookieValue = c.substring(nameEQ.length,c.length);
  	    return cookieValue;
  		}
  	}
  	return null;
  }
  
  var fetchCachedOauthToken = function(callback) {
    var token = readCookie(cachedOauthTokenCookieName)
    if (!token || token == "") {
      fetchOauthToken(function(token){
        // Comment from ber. Actually I've removed the expire, because 
        // it causes issue with session cookie not being persistent. 
        // 
        // The session cookie not only contains the request token (that we cache in a cookie here)
        // but also the corresponding request token secret. So using a cached cookie after session 
        // has expired will lead to a "silent" auth failure, leading to the experience described
        // by users ("I have to log twice"). 
        //
        // Without the domain we may get into situation when two cookies 
        // for .example.com and www.example.com exist. In this case,
        // clearing one of them won't discard another and we'll get strange issues.
        createCookie(cachedOauthTokenCookieName, token, null) // cookie expires with browsing session
        callback(token)
      })
    } else {
      callback(token)
    }
  }
  
  var clearCachedOauthToken = function() {
    createCookie(cachedOauthTokenCookieName, "", -3600)
  }
  
  var updateURL = function(url) {
    var iframe = $('login-iframe')
    iframe.setStyle({visibility:'hidden'})
    //Event.observe(iframe, 'load', function(e){
    setTimeout(function(){  
      iframe.setStyle({visibility:'visible'})
    }, 400)
    fetchCachedOauthToken(function(token){
    
      clearCachedOauthToken()
      iframe.src = url + token
    })
  }
  
  var animateToRegistrationForm = function() {
    currentDialog.addClassName(registrationFormCSSClass)
    updateURL(options.register_url)
  }
    
  
  //
  // Public 
  //
  
  // Note: some methods are called "getXYZ" because that way 
  //       they do not look like no-method-call properties
  
  var getInfo = function() {
    return info
  }
  
  var isLoggedIn = function() { return !(!getInfo()) }
  
  var isAdminpedia = function() {
    return (info ? info.is_adminpedia : false)
  }

  var getId = function() {
    return (info ? info.id : null)
  }
      
  var setInfo = function(inf) {
    info = inf
  }
  
  var hidePanel = function() {
    if (!currentDialog) return
    
    if (/MSIE/.test(navigator.userAgent)){
      restoreYPosition()
      setHeightAndOverflowForIE("auto", "auto")
      showSelects()
    }
    
    overlay.style.display = "none"
    $(currentDialog).style.display = "none"
    currentDialog = null
  }
  
  var logoutWithUrl = function(logoutUrl) {
    window.location = logoutUrl + "?callback=" + document.location;
  }
  
  var requireLogin = function(callback) {
    
    // in case there is already a logged user, just call the callback and return
    if (isLoggedIn()) {
      callback(instance);
      return; 
    }
    
    // no logged user, start the login process
    createOverlay()
    requireLoginCallback = callback
    if (currentDialog) { hidePanel() }
    currentDialog = $('login_panel')
    currentDialog.removeClassName(registrationFormCSSClass)
    
    updateURL(options.login_url)
    
    if (/MSIE/.test(navigator.userAgent)){
      storeYPosition()
      setHeightAndOverflowForIE('100%', 'hidden')
      window.scrollTo(0,0)
      hideSelects()
      showSelects()
    }
    overlay.style.display = "block"
    currentDialog.style.display = "block"
  }
  
  // legacy method which reloads the page
  var requireLoginAndRedirectTo = function(url) {
    requireLogin(function(){
      if (url) { location.href = url }
    })
  }
  
  var requireLoginAndRedirectToUserPage = function() {
    this.requireLoginAndRedirectTo("/dashboard");
  }
  
  // Usage:
  // <a href="http://help.fotopedia.com/" onclick="return MMT.CurrentUser.requireLoginForAnchorTag(this)">
  var requireLoginForAnchorTag = function(anchorTag) {
    requireLoginAndRedirectTo(anchorTag.href)
    return false
  }
  
  
  var closePanel = function() {
    hidePanel()
  }
    
  var openRegistrationForm = function(url) {
    if (currentDialog) {
      if (url) requireLoginCallback = function(){ location.href = url }
      animateToRegistrationForm()
    } else {
      requireLoginAndRedirectTo(url)
      animateToRegistrationForm()
    }
  }
  
  // iframe response
  var loginDidComplete = function(inf) {
    
    setInfo(inf)
    
    closePanel()
    
    MMT.log("User Logged in:")
    MMT.log(info)
    
    if (requireLoginCallback) {
      requireLoginCallback(instance)
    }
  }
  
  var setOptions = function(opts) {
    options = opts
  }
  
  var preloadOauthToken = function() {
    if (!info) { // preload oauth token if nobody is logged in
      fetchCachedOauthToken(function(token){ })
    }
  }
  
  // Public methods
  
  instance = {
    isAdminpedia:  isAdminpedia,
    isLoggedIn:    isLoggedIn,
    
    getId:         getId,
    getInfo:       getInfo,
    setInfo:       setInfo,
    
    setOptions:           setOptions,
    preloadOauthToken:    preloadOauthToken,
    
    logoutWithUrl:             logoutWithUrl,
    requireLogin:              requireLogin,
    requireLoginAndRedirectTo: requireLoginAndRedirectTo,
    requireLoginAndRedirectToUserPage: requireLoginAndRedirectToUserPage,
    requireLoginForAnchorTag:  requireLoginForAnchorTag,
    closePanel:                closePanel,
    openRegistrationForm:      openRegistrationForm,
    loginDidComplete:          loginDidComplete
  }
  
  return instance;
  
})()


// Simple console replacement for IE
if (typeof(console) === "undefined") console = {log: function(){}}


// Base object for OOP with prototypal inheritance
var O = {
  clone: function() {
    var C = function(){}
    C.prototype = this
    var obj = new C()
    //obj.init.apply(obj, arguments)
    return obj
  },

  cloneWithBlock: function() {
    var args = Array.prototype.slice.apply(arguments)
    var block = args.pop()
    var obj = this.clone.apply(this, args)

    block.apply(obj, args)

    // var init1 = this.init
    // var init2 = obj.init
    //
    // if (init2 !== init1 || !init2) {
    //   obj.init = function(){
    //     if (init1) init1.apply(this, arguments)
    //     if (init2) init2.apply(this, arguments)
    //   }
    // }
    return obj
  },

  createSetter: function(name, value) {
    if (arguments.length > 1) this[name] = value
    this["set" + name.substr(0,1).toUpperCase() + name.substr(1)] = function(v) {
      this[name] = v
      return this
    }
    return this
  },

  //init: function(){},

  _:0
}




// Don't modify the line below unless you update AssetsManagement::Uploader in the same time.
MMT.Assets = { base_url: 'http://assets.cdn.prod.fotopedia.com/picor/740731b34121ae3ae2c0e7a7d932eccb7327d407' };
MMT.Assets.prefetch_assets = function() {
  var image;
  MMT.Assets.assets = [];
  
  // so that closing disclosure triangle doesn't glitch
  image = new Image();
  image.src = MMT.Assets.base_url+'/assets/web/disclosure-closed.png';
  MMT.Assets.assets.push(image);
}

document.observe('mmt:dom-loaded', function() {
  MMT.Assets.prefetch_assets();
})



MMT.Image = Class.create({
  initialize:function (src, options) {
    this.options = {
      onLoad: function(image) { },
      onError: function(image) { },
      onAbort: function(image) { }
    }
    Object.extend(this.options, options || {});
    
    // public members
    this.src = src;
    this.license_url = null;
    this.reset();
  },
  
  dispose: function() {
    this.reset();
    delete this.options;
  },
  
  reset: function() {
    if (this.image) {
      this.image.onload = null;
      this.image.onerror = null;
      this.image.onabort = null;
      delete this.image;
    }
    this.loading = false;
    this.loaded = false;
    this.error = false;
    this.aborted = false;
    this.width = null;
    this.height = null;
  },
  
  needsLoading: function() {
    if (this.loaded) return false;
    if (this.loading) return false;
    return true;
  },
  
  load: function() {
    if (!this.needsLoading()) { return; }

    this.loading = true;
    this.error = false;
    this.aborted = false;

    this.width = null;
    this.height = null;
    this.image = new Image;
    
    if (this.license_url && ! (/MSIE/.test(navigator.userAgent))) { 
      this.image.setAttribute('href', this.license_url); 
      this.image.setAttribute('rel', 'license');
    }

    this.image.onload = this.onLoad.bindAsEventListener(this);
    this.image.onerror = this.onError.bindAsEventListener(this);
    this.image.onabort = this.onAbort.bindAsEventListener(this);
    
    this.image.src = this.src;
    
    // if (this.alert_timeout) clearTimeout(this.alert_timeout);
    // this.alert_timeout = setTimeout(function() {
    //   alert('still no news after 5 seconds');
    // }.bind(this), 5000);
  },
  
  onLoad:function(event) {
    // if (this.alert_timeout) clearTimeout(this.alert_timeout);
    if (!this.image) return;
    this.loading = false;
    this.loaded = true;
    this.width = this.image.width;
    this.height = this.image.height;
    this.options.onLoad(this);
  },
  
  onError:function(event) {
    // if (this.alert_timeout) clearTimeout(this.alert_timeout);
    if (!this.image) return;
    // alert("Image "+this.src+" could not load")
    this.loading = false;
    this.error = true;
    this.options.onError(this);
  },
  
  onAbort:function(event) {
    // if (this.alert_timeout) clearTimeout(this.alert_timeout);
    if (!this.image) return;
    this.loading = false;
    this.aborted = true;
    this.options.onAbort(this);
  }
});


MMT.Social = {


  // parts_from_string_with_format()
  //
  // takes an array string of the form [ format, arg1, arg2, ....]
  // where format is a format string where format specifications are of the form "{1,type}"
  // and returns an array with a list of string parts. 
  // each part is a 2 elements array whose first value is the type of the part, and the second element is 
  // its value. 
  // Text which is not in a format is considered "litteral" 
  // 
  // Example:
  //
  // parts_from_string_with_format(['Both urls: {1,url} {2,url}. Second url: {2,url}', 'http://url1.org', 'http://url2.org'])
  //  returns
  //  [
  //    ['litteral', 'Both urls: '],
  //    ['url', 'http://url1.org'],
  //    ['litteral', ' '],
  //    ['url', 'http://url2.org'],
  //    ['litteral', '. Second url: '],
  //    ['url', 'http://url2.org']
  //  ]
  // 
  // 
  parts_from_string_with_format: function(input) {
    var elements = new Array(); 
    var str = input[0];

    while (str.length > 0) {
      var pattern = /\{([^}]*)}/g;
      if (!pattern.test(str)) break; // did not find any format
      
      str = RegExp.rightContext;
      
      var litteral = RegExp.leftContext;
      if (litteral.length > 0) {
        elements.push(['litteral', litteral]);
      }
      
      var spec = RegExp.lastParen;
      var specUnits = spec.split(',');
      elements.push([specUnits[1], input[specUnits[0]]]);
    }

    if (str.length > 0) {
       elements.push(['litteral',str]);
    }
    
    return elements;
  },
  
  // takes an array like the one obtained with parts_from_string_with_format() 
  // and concatenates it into a string. Each part must be a string litteral.
  // parts which are not 'litteral' types will be ignored
  string_from_litteral_parts: function(parts) {
    var result = ""; 
    for (var partIndex in parts) {
	    var part = parts[partIndex];

      if (part[0] != "litteral") continue; 
      result = result + part[1];
    }
    return result;
  }
};

MMT.Social.Email = {
	// Valid options are:
	// Valid options are:
	// - subject
	// - body
	post_new_message: function(options) 
	{
		// alert('send an email with subject:\n'+options.subject+'\nand body:\n'+options.body);
		var mailtoURL = 'mailto:?subject=' + encodeURIComponent(options.subject) + '&body=' + encodeURIComponent(options.body);
		this.serviceWindow = window.open(mailtoURL, 'mail', 'width=100, height=100');
		window.focus();
		this.serviceWindow.close();		
	},
	
	serviceWindow: null
};

MMT.Social.Twitter = {
	// Valid options are:
	// - url: a url to post on twitter. Url will be bitlyfied before being posted to twitter
	// - format: a format array of the form [format_string, arg1, arg2, ...] where args can be urls that will be bitlyfied
	// 
	// Note: url and format are mutually exclusive
	post_new_message: function(options) 
	{
		// bitly shorten-ification callback will not be able to open a window itself with most 
		// popup-window blockers. Most blockers let js open popup window on user actions, though. 
		// We thus open the window on user action, and bitly callback will set its url afterward
		this.serviceWindow = window.open('', 'twitter', '');
		this.serviceWindow.document.write('Opening twitter ...');
		this.serviceWindow.focus();
		
		// set up current format array
		if (options.url) {
		  this.current_format_parts = [['url', options.url]];
	  } else if (options.format) {
	    this.current_format_parts = MMT.Social.parts_from_string_with_format(options.format);
    } else {
      return; // nothing to do, no parameter !
    }
    
   this.shorten_urls_in_current_format_parts();
	},

	// private methods
	shortenDone: function(data) 
	{
		var shortURL;
		var longURL;
		
		// Results are keyed by longUrl, so we need to grab the first one.
		for (var r in data.results) {
			var result = data.results[r];
			shortURL = result['shortUrl']; 
			longURL = r;
			break;
		}

		var new_format_parts = new Array();
	  for (var partIndex in this.current_format_parts) {
	    var part = this.current_format_parts[partIndex];
	    if (part[0] == 'url' && part[1] == longURL) {
	      new_format_parts.push(['litteral', shortURL]);
      } else {
        new_format_parts.push(part);
      }
    }
		
		this.current_format_parts = new_format_parts;
		if (this.shorten_urls_in_current_format_parts()) return; // still some urls to shorten
		
		var statusString = MMT.Social.string_from_litteral_parts(this.current_format_parts);
		this.current_format_parts = null; 
		
		var twitterURL = 'http://twitter.com/timeline/home?status='+encodeURIComponent(statusString);
		this.serviceWindow.location = twitterURL;
		this.serviceWindow.focus;
	}, 
	shorten_urls_in_current_format_parts: function() {
	  var url = null; 
	  
	  for (var partIndex in this.current_format_parts) {
	    var part = this.current_format_parts[partIndex];

	    if (part[0] != 'url') continue;
	    url = part[1];
	    break;
    }
    
    if (url) {
		  // launch async bitlyfication of url
		  BitlyClient.shorten(url, 'MMT.Social.Twitter.shortenDone');
		  return true;
	  } 
	  
	  return false;
  },
  
  // ivars 
	serviceWindow: null,
	current_format_parts: null
};

MMT.Social.Facebook = {
	// Valid options are:
	// - url : a url to post on facebook
	post_new_message: function(options) 
	{
		var facebookURL = 'http://www.facebook.com/sharer.php?u='+encodeURIComponent(options.url);
		this.serviceWindow = window.open(facebookURL, 'sharer', 'width=626, height=436');
		this.serviceWindow.focus();
	},
		
	serviceWindow: null  
};


MMT.Social.Reddit = {
	// Valid options are:
	// - url : a url to post on reddit
	post_new_message: function(options) 
	{
		var redditURL = 'http://reddit.com/submit?url='+encodeURIComponent(options.url);
		this.serviceWindow = window.open(redditURL, 'reddit', '');
		this.serviceWindow.focus();
	},
		
	serviceWindow: null  
};

MMT.Social.Delicious = {
	// Valid options are:
	// - url : a url to post on delicious
	post_new_message: function(options) 
	{
		var deliciousURL = 'http://del.icio.us/post?url='+encodeURIComponent(options.url);
		this.serviceWindow = window.open(deliciousURL, 'delicious', '');
		this.serviceWindow.focus();
	},
		
	serviceWindow: null  
};

MMT.Social.Digg = {
	// Valid options are:
	// - url : a url to post on digg
	post_new_message: function(options) 
	{
		var diggURL = 'http://digg.com/submit?phase=2&url='+encodeURIComponent(options.url);
		this.serviceWindow = window.open(diggURL, 'digg', '');
		this.serviceWindow.focus();
	},
		
	serviceWindow: null
};





if (Object.isUndefined(MMT)){
	throw("data_source_item_collection.js requires including mmt.js library");
}

/*jslint white: false, plusplus:false, onevar:false, eqeqeq:false*/
// How to use this datasource as a source of instances of MyItem (replace with your class name) :
//
// Understand that:
// - MMT.DataSourceItemCollection.dataSourceItemAtIndex() returns instances of MyItem.
// - MMT.DataSourceItemCollection assumes theses items are loaded asynchronously from some url we'll discuss later
// - this url should provide with *representations* of MyItem instances (your MMT.DataSourceItemCollection subclass will have to deal with the conversion)
// - for MyItems not yet loaded, the MMT.DataSourceItemCollection.dataSourceItemAtIndex() should return "placeHolder" MyItem
//
// When you initialize the dataSource, you tell it, one way or another, how many elements it contains.
// But after a reset, it is not always possible to know in advance how many elements there will be.  For instance, reset happens when we change
// the search criteria.  At the very beginning, we don't know, until the server tells us, how many results there gonna be.
// so, the datasource switches to a mode where it is underterminate.  In this mode, itemAtIndex raises an exception.  dataSourceItemCount returns "undefined"
//
// You can suclass this  class and override the following methods.
//
//      buildDataSourceItemsFromObjects: function(data_source_item_representations)
//        this method should convert an external representations (can be an array, but we make no hypothesis on that) coming from 
//        the ajax request or the option data_source_items of MMT.DataSourceItemCollection constructor,
//        to an array of MyItem instances.
//        the result of this method can be a simple array of MyItem.  But it can also be an object with the key 'items', containing the array of MyItem.
//        In the case it is an object, there can be the key totalNumberOfItems that must be the total length of the datasource.  Of course, items may 
//        contain less elements than 'totalNumberOfItems'.
//        there can also be a key 'offset' to inform about where in the total collection are located the 'items'.
//
//      newPlaceholderDataSourceItem
//        this method should return a placeholder instance of MyItem (a temporary version of a MyItem that will be loaded eventually)
//
//      makeDownloadResourceURLWithLimits: function(range)
//        this methods return the url of the ajax endpoint to retrieve items on the range 
//        you can customize how the url should be build (this method is given 'from' and 'limit' argument)

//     
//   note that the default implementation first check if the delegate implements them.  In this case, it calls the delegate.   
//
// You may provide the datasource with a delegate compliant with the following protocol:
//
//      dataSourceItemCollection_itemCountHasChanged(MMT.DataSourceItemCollection, count)
//        Called when the number of items has changed.
//
//      dataSourceItemCollection_didUpdateDataSourceItem_atIndex(MMT.DataSourceItemCollection, Object, index)
//        Handler called when the sourceItem (Object) at given index has changed. Delegate can update view if necessary, etc.
//
//      dataSourceItemCollection_bestRangeForRange(MMT.DataSourceItemCollection, MMT.Range)
//        This two optional method help optimizing the loading of MyItem representations. Before the data source will load items from index a to index b, it will call these two methods on its delegqte.
//        The delegate will thus have the opportunity to modifiy the actual range of loaded items.
//
//			dataSourceItemCollection_startLoadingItemsData(MMT.DataSourceItemCollection, MMT.Range)
//				This method inform delegate about start fetching data for items from dataSource in range
//
//			dataSourceItemCollection_endLoadingItemsData(MMT.DataSourceItemCollection, MMT.Range)
//				This method inform delegate about finish fetching data for items from dataSource in range
//
//       dataSourceIsDeterminated
//         inform the delegate that the datasource is now determinated (ie:  it knows how many arguments it contains)
//

/*global MMT, Class, Ajax */

// this object follows Cocoa NSRange convention.
MMT.Range = Class.create({
    initialize: function(offset, length){
        this._location = offset;
        this._length = length;
    },
    isInvalid: function(){
        return this.location == MMT.Range.NotFound;
    },
    contains: function(x){
        return x >= this.location && x < this.location + this.length;
    },
    location: function(){
        return this._location;
    },
    length: function(){
        return this._length;
    },
    
    // be carefull that maxRange is NOT in the range.  This is consistent with the usual conventions of right bound of intervals.
    maxRange: function(){
        return this._location + this._length;
    },
    setMaxRange: function(val){
        if(val < this._location){
            throw "maxRange before location in setMaxRange";
        }
        this._length = val - this._location;
    },
    each: function(f){
        var i;
        for(i = this._location; i < this._location + this._length; ++i){
            f(i);
        }
    },
    
    // update the range to change it's origin, leaving the maxRange untouched (hence, length is modified accordingly)
    setMinRange: function(val){
      var currentMaxRange = this.maxRange();
      if(val > currentMaxRange){
        throw "minRange set above maxRange";
      }
      
      this._location = val;
      this._length = currentMaxRange - val;
    }
});

Object.extend(MMT.Range, {
    NotFound: -1,
    makeInvalid: function(){
        return new MMT.Range(NotFound, 0)  // the undefined range.
    },
    
    // return a new range that exactly contains the two provided indices
    // we should have a <= b
    // the returned range contains both a and b
    makeRangeContainingIndices: function(a,b){
        return new MMT.Range(a, b-a+1);
    }
}
);


MMT.DataSourceItemCollection = Class.create({
  // PUBLIC
  // - data_source_item_count should be set to the actual count of items
  // - data_source_items - optional array of preloaded item representations, used to avoid asynchronous loading.  It can be a subset of the total content of 
  //   the collection.
  // - data_source_items_offset -  when 'data_source_items' is provided, specify the offset where those items should be considered in the 
  //   total datasource.
  // 
  // when 'data_source_item_count' is not provided (and no preloaded items are given in 'data_source_items'), then the datasource is in an undeterminate state 
  // (call datasource.reload() to have the datasource determinated.  This is an AJAX process)
  // 
  // when 'data_source_items'

  initialize: function(options) {
    this.options = {
      data_source_items_url: null,  // Prefix for items URL - should work when appended /from/N/limit/N
      data_source_item_count: undefined,
      preloaded_data_source_items: null, // Array of DataSourceItems JSON representations
      preloaded_data_source_items_offset: 0, // when data_source_items is provided, specify the offset where those items starts
      responseFormat: 'json'
    }
    Object.extend(this.options, options || {});
    
    var preloadedItems = this.options.preloaded_data_source_items;
    if(!preloadedItems){
        if(this.options.preloaded_data_source_items_div_id){
            var preloadedItemsAsDOMElement = $(this.options.preloaded_data_source_items_div_id);
            if(!preloadedItemsAsDOMElement){
                throw "Could not find preloaded DOM Div with id: " + this.options.preloaded_data_source_items_div_id;
            }
            preloadedItems = this.parseDOMElement(preloadedItemsAsDOMElement);
        }
    }
    
    if (preloadedItems) {
        var tmp = this._buildDataSourceItemsFromObjects(preloadedItems);
        this.data_source_items = tmp.items;                      // must be there
        if(undefined == this.data_source_items){
            throw "bad initialization of the DataSource";
        }
        // tmp.offset and tmp.totalNumberOfItems can be undefined.
        this.loaded_start_index = tmp.offset || this.options.preloaded_data_source_items_offset || 0;
        this.data_source_item_count = tmp.totalNumberOfItems || this.options.data_source_item_count || this.data_source_items.length;
    }
    else{
        // Array of loaded items
        this.data_source_items = new Array();

        // index of first element of this.data_source_items, the first loaded item, in the toc_entry
        // (meaningless if this.data_source_items is empty).
        this.loaded_start_index = 0;
        this.data_source_item_count = this.options.data_source_item_count;  // could be undefined at this stage.
    }
    
    // public members, r/o
    this.data_source_items_url = this.options.data_source_items_url;
    this.delegate = null;
    
    // PRIVATE
    
    // FIFO of needed items indexes
    this.needed_indexes = new Array();
    
    // current request for items
    this.current_request = null;
		this.current_request_range = null;
    
    
    // Array of placeholder data_source_items
    this.placeholder_data_source_items = {};
  },

  // PUBLIC
  setDelegate: function(delegate)
  {
    this.delegate = delegate;
  },
  
  // PUBLIC
  // this should be called after the initialization.  This will notify the delegate about all the currently loaded elements of the collection
  // by calling dataSourceItemCollection_didUpdateDataSourceItem_atIndex
  awake: function()
  {
    var i = 0;
    var me = this;
    if(this.delegate && this.delegate.dataSourceItemCollection_didUpdateDataSourceItem_atIndex){
      this.data_source_items.each(function(item, index){me.delegate.dataSourceItemCollection_didUpdateDataSourceItem_atIndex(me, item, index+me.loaded_start_index);});
    }
  },

  // PUBLIC
  // reset the state variable as if the data source was just instantiated, with no initial content.
  // the delegate is preserved.
  unload: function() {
	if(this.current_request){
		this.current_request.abort();
		this.current_request = null;
		
		// end (abort) loading items data delegation warning
		if (this.delegate && this.delegate.dataSourceItemCollection_endLoadingItemsData && this.current_request_range) {
			var range = new MMT.Range(this.current_request_range.location(), this.current_request_range.length());
			// debug('end   (abort): [' + range.location() + ', ' + range.length() + ']');
			this.delegate.dataSourceItemCollection_endLoadingItemsData(this, range);
		}
		this.current_request_range = null;
		
	}
	this.loaded_start_index = 0;
	this.data_source_items = new Array();
	this.placeholder_data_source_items = {};
	this.needed_indexes = new Array();
	
	delete this.data_source_item_count;
	
	// past this point, the DataSource does not know how many items it have.
	// it is in indeterminate state.
  },

  // only meaningfull for network base request.
  // this will clear the state of the datasource (unload) and fire a request that will query the first results AND
  // the number of elements of the data source.  On completion, the delegate is notified using the method 'dataSourceIsDeterminated'
  reload: function() {
	this.unload();
	var range = new MMT.Range(0, 1);
	if(this.delegate && this.delegate.dataSourceItemCollection_bestRangeForRange){
	    range = this.delegate.dataSourceItemCollection_bestRangeForRange(this, range);
	}
    var url = this.makeDownloadResourceURLWithLimits(range);
		
		// start loading first items data delegation warning
		if(this.delegate && this.delegate.dataSourceItemCollection_startLoadingItemsData){
			// debug('start (first): [' + range.location() + ', ' + range.length() + ']');
			this.delegate.dataSourceItemCollection_startLoadingItemsData(this, range);
		}
		
		this.current_request_range = range;
    this.current_request = new Ajax.Request(
      url, {
      method: 'get',
      evalJSON: this.options.responseFormat == 'json' ? 'force' : false,  // should be true. But since Rails cache stores all files as text/html, prototype wouldn't fill transport.responseJSON without this forcing
      requestHeaders: { Accept: this.responseFormat() },
      onComplete: this.firstRequestDone.bind(this, range),
      onException: function(request, exception){error('got exception: ' + exception);}
    });	
  },

  // PRIVATE network callback
  firstRequestDone: function (range, transport) {
	  debug('transport answer to firstRequest');
      this.current_request = null;
			
			// end loading first items data delegation warning
			if (this.delegate && this.delegate.dataSourceItemCollection_endLoadingItemsData) {
				// debug('end   (first): [' + range.location() + ', ' + range.length() + ']');
				this.delegate.dataSourceItemCollection_endLoadingItemsData(this, range);
			}
			this.current_request_range = null;
			
      var tmp = this.buildDataSourceItemsFromXHRResponse(transport);
      this.data_source_item_count = tmp.totalNumberOfItems;
      this.processLoadedDataSourceItems(tmp.items, range);
      this.processNextNeedForDataSourceItem();
      this.dataSourceIsDeterminated();
  },
  
  // PUBLIC
  dataSourceItemCount: function()
  {
    return this.data_source_item_count;
  },
  
  // PUBLIC
  //
  // Returns an MyItem instance.
  dataSourceItemAtIndex: function(index)
  {
	if (this.data_source_item_count == undefined){
		throw {
			name: 'BadArgument',
			message: 'You try to get an item from a datasource in an undefined state'
		}
	}
    if (index < 0 || index > this.data_source_item_count - 1)
      return null;
    
    var result = this._internalLoadItemAtIndex(index);
    if(result != undefined){
        return result;
    }
    
    var placeholder_data_source_item = this.placeholder_data_source_items[''+index];
    
    if (!placeholder_data_source_item) {
      placeholder_data_source_item = this.newPlaceholderDataSourceItem();
      this.placeholder_data_source_items[''+index] = placeholder_data_source_item;
      // we actually created an item at this index (a placeholder one) -> warn the delegate

      // funny reentrency possibility there.  do the things in the appropriate order
      this.pushNeedForDataSourceItemAtIndex(index);
    }
    
    return placeholder_data_source_item;
  },
  
  // PRIVATE
  _internalLoadItemAtIndex: function(index)
  {
      var internal_index = index - this.loaded_start_index;
      if (this.data_source_items.length > 0) {
        if (internal_index >= 0 && internal_index < this.data_source_items.length) {
          if (this.placeholder_data_source_items[''+index]) {
            this.placeholder_data_source_items[''+index].dispose();
            delete this.placeholder_data_source_items[''+index];
          }
          return this.data_source_items[internal_index];
        }
      }
      return undefined;      
  },
  
  // PUBLIC
  indexForDataSourceItem: function(data_source_item)
  {
    // look into placeholder_data_source_items
    for (var index in this.placeholder_data_source_items) {
      var pe = this.placeholder_data_source_items[''+index];
      if (pe == data_source_item) {
        return parseInt(index);
      }
    }
    
    // look into "real" items
    for (index=0; index < this.data_source_items.length; index++) {
      var pe = this.data_source_items[index];
      if (pe == data_source_item) {
        return index + this.loaded_start_index;
      }
    }

    return -1;
  },

	// PUBLIC
	// return the most recent request index...  not very clear right now.
  maxLoadedIndex: function () {
	return this.data_source_items.length + this.loaded_start_index
  },
  
  // public
  // return yes, if there is an AJAX request in progress.
  isLoading: function() {
      return !!this.current_request;
  },
  
  // PRIVATE
  // Subclasses must override
  // Must not return null
  newPlaceholderDataSourceItem: function() {
  	if(this.delegate && this.delegate.newPlaceholderDataSourceItem){
  		return this.delegate.newPlaceholderDataSourceItem();
  	}
    else {
    	var htmlString = this.placeHolderHtml;

    	if(!htmlString){
    	  htmlString = this.options.place_holder_html;
    	  if(!htmlString){
  	      htmlString = this.options.placeHolderId ? $(this.options.placeHolderId).innerHTML : "<div></div>";
  	    }
	      this.placeHolderHtml = htmlString;
	    }

    	return new MMT.DataSourceItemCollection.SimpleItem({html_value: htmlString});
	  }
  },
  
  
  // PRIVATE
  // Append index to the queue of needed indexes, and triggers a request
  pushNeedForDataSourceItemAtIndex: function(index)
  {
    for (var i=0; i < this.needed_indexes.length; i++) {
      if (this.needed_indexes[i] == index)
        return; // already pending
    }
    // push required index in the FILO
    this.needed_indexes.push(index);
    this.processNextNeedForDataSourceItem();
  },
  
  // PRIVATE
  // May launch a request that'll load requested items
  processNextNeedForDataSourceItem: function()
  {
    if (this.current_request)
      return;
    
    var range = null;
    
    
    if (this.data_source_items.length == 0) {
      // initialisation is a special case: we don't want to extend in any way
      
      // return if no need
      if (this.needed_indexes.length == 0)
        return;
        
        // pop required index from the FILO
      var index = this.needed_indexes.pop();

      range = new MMT.Range(index, 1);
      
      // let the delegate do some page rouding (for instance, instead of loading item 2, load from item 0, since we have 10 items per page)
      if (this.delegate && this.delegate.dataSourceItemCollection_bestRangeForRange) {
        range = this.delegate.dataSourceItemCollection_bestRangeForRange(this, range);
        // if the delegate cancel the download, the request is silently cancel.  Let's suppose this is what we want now.
        // FIXME: we're not sure processNextNeedForDataSourceItem will be called again!!!
      }           
      
    } else {
      // general case: we'll prepend or append items

      // load next required index
      range = this.nextNeededDataSourceItemRange();
      
      // return if no need
      if (!range)
        return;
      // load some items before this.loaded_start_index, or some items after this.loaded_start_index + this.data_source_items, so that index is included
    }
    
    
    if (!range) {
      return;
    }
    
    // 2. Load items
    
    if(range.maxRange() > this.data_source_item_count){
        range.setMaxRange(this.data_source_item_count);
    }
    if(range.location() < 0){
        throw "range.location is negative";
    }
    
    var url = this.makeDownloadResourceURLWithLimits(range);

		// start loading next items data delegation warning
		if(this.delegate && this.delegate.dataSourceItemCollection_startLoadingItemsData){
			// debug('start (next) : [' + range.location() + ', ' + range.length() + ']');
			this.delegate.dataSourceItemCollection_startLoadingItemsData(this, range);
		}
		
		this.current_request_range = range;
    this.current_request = new Ajax.Request(url, {
        method: 'get',
        evalJSON: this.options.responseFormat == 'json' ? 'force' : false,  // should be true. But since Rails cache stores all files as text/html, prototype wouldn't fill transport.responseJSON without this forcing
        requestHeaders: { Accept: this.responseFormat() },

        onComplete: function(transport) {
          this.current_request = null;
					
					// end loading next items data delegation warning
					if (this.delegate && this.delegate.dataSourceItemCollection_endLoadingItemsData) {
						// debug('end   (next) : [' + range.location() + ', ' + range.length() + ']');
						this.delegate.dataSourceItemCollection_endLoadingItemsData(this, range);
					}
					this.current_request_range = null;
					
          var tmp = this.buildDataSourceItemsFromXHRResponse(transport);
          this.processLoadedDataSourceItems(tmp.items, range);
          this.processNextNeedForDataSourceItem();
        }.bind(this)
    });
  },
  
  // PRIVATE
  // Subclasses MUST override it to generate the url that will fetch the requested results.

  makeDownloadResourceURLWithLimits: function(range) {
      var from_index = range.location();
      var limit = range.length();
    var baseURL = null;
    if(this.delegate && this.delegate.baseURLForDataSource) {
      baseURL = this.delegate.baseURLForDataSource(this, this.data_source_items_url);
    }
    if(baseURL == null) {
      baseURL = this.data_source_items_url;
    }
    var url = baseURL +
                '/from/'    + from_index +
                '/limit/'   + limit;
    return url;
   },
   
   // PRIVATE
   // Subclasses can override this.
   // this is the header ACCEPT sent to the server.  By default, the datasource tells the server it wants to receive json data.
   // if custom datasource expect something else, it should be redefined.  
   responseFormat: function(){
       if(this.delegate && this.delegate.responseFormat){
           return this.delegate.responseFormat();
       }
       else{
          if(this.options.responseFormat == 'json'){
           return 'application/json, *'+'/'+'*';
          }
          else if(this.options.responseFormat == 'html'){
      	    return 'text/html';            
          }
          else if(this.options.responseFormat == 'xml'){
            return 'text/xml';
          }
          else{
            throw "unsupported format " +  this.options.responseFormat;
          }
       }
   },
   
   // PROTECTED
   // helper to parse a DOM fragment and convert it to a json object.
   	parseDOMElement: function(domElement) {
	    var jsonVersion = domElement.getAttribute("metaData").evalJSON(true);
	    jsonVersion.items = Element.childElements(domElement).map(function(rowElement){
           var hash = rowElement.getAttribute("metaData").evalJSON(true);
           hash.html_value = rowElement.innerHTML;
           return hash;
	    });
	    return jsonVersion;
   },
   
   // PROTECTED, state less
   // helper that convert (and modify in place) its argument (a json object) to complete it with the
   // 'html' key in case it is absent.  Trying to grab it from an eventual DOM Element
   extractHTMLFragmentFromDOMIfNeeded: function(jsonData){
     if(jsonData.html_value){
       // already there
       return jsonData;
     }
     
     if(jsonData.html_div_id){
       var divElement = $(jsonData.html_div_id);
       if(divElement){
         // ok, very braindead way to just get the fucking html source
         var tmpDiv = document.createElement('div');
         var myClone = divElement.cloneNode(true);   // deep clone
         tmpDiv.appendChild(myClone);
         jsonData.html_value = tmpDiv.innerHTML;
       }
     }
     return jsonData;
   },


   // PRIVATE
   // subclass can implement this.  It is given the XHR Response as input and must answer with an array of model objects
   buildDataSourceItemsFromXHRResponse: function(response){
     if(this.options.responseFormat == 'json'){
       return this._buildDataSourceItemsFromObjects(response.responseJSON);
     }
     else if(this.options.responseFormat == 'html'){
       return this.buildDataSourceItemsFromHTMLResponse(response.responseText)
     }
     else if(this.options.responseFormat == 'xml'){
       return this.buildDataSourceItemsFromXMLResponse(response.responseXML)
     }
   },
   
   childElements: function(element){
      var result = [];
      var child = element.firstChild;
      while(child){
        if(child.nodeType == 1){
          result.push(child);
        }
        child = child.nextSibling;
      }
      return result;
   },
   
   buildDataSourceItemsFromXMLResponse: function(xml) {
     if(!xml){
       return {};
     }
     var jsonVersion = MMT.jsonFromXML(xml);
     return this.buildDataSourceItemsFromObjects(jsonVersion);
   },
   
 	 buildDataSourceItemsFromHTMLResponse: function(doc) {
 	    if(!doc){
 	        return {};
 	    }
 	    var root = document.createElement('div');
 	    root.innerHTML = doc;
 	    var responseNode = Element.childElements(root)[0];
 	    var jsonVersion = responseNode.getAttribute("metaData").evalJSON(true);
 	    jsonVersion.items = Element.childElements(responseNode).map(function(rowElement){
             var hash = rowElement.getAttribute("metaData").evalJSON(true);
             hash.html_value = rowElement.innerHTML;
             return hash;
 	    });
 	    return this.buildDataSourceItemsFromObjects(jsonVersion);
     },
   
   
   // REALLY PRIVATE,
   _buildDataSourceItemsFromObjects: function(jsonData){
       var tmp = this.buildDataSourceItemsFromObjects(jsonData);
       // here, we handle the various kind of answers from the previous call
       // from the documentation, tmp can either be an array, or an object.
       // we answer with a normal form that looks like this
       //
       // {
       //    items :  [],                    //array of MyItem
       //    totalNumberOfResults:   ..      // can be undefined
       //    offset: ..                      // can be undefined
       // }
       
       if(tmp.items != undefined){
           // new API implemented, we return tmp unchanged.
           return tmp;
       }
       else{
           // old form, this is presumably an array (we should check and assert if it is not)
           // the other keys are going to be undefined.
           return {items: tmp};
       }
   },
  // PRIVATE
  // Subclasses must override or delegate must implement
  buildDataSourceItemsFromObjects: function(data_source_item_representations) {
  	if(this.delegate && this.delegate.buildDataSourceItemsFromObjects){
  		return this.delegate.buildDataSourceItemsFromObjects(data_source_item_representations);
  	}
  	else{
    	var results =  [];
    	var size = data_source_item_representations.items ? data_source_item_representations.items.length : 0;
    	for (var i = 0; i < size; i++){
    	  var jsonData = this.extractHTMLFragmentFromDOMIfNeeded(data_source_item_representations.items[i]);
    		results.push(new MMT.DataSourceItemCollection.SimpleItem(jsonData));
    	}
    	return {items:results, totalNumberOfItems:data_source_item_representations.totalNumberOfItems};
  	}
  },

  // PRIVATE
  // CAN be subclass or the delegate CAN implement the method
  dataSourceIsDeterminated: function() {
	if(this.delegate && this.delegate.dataSourceIsDeterminated){
		this.delegate.dataSourceIsDeterminated(this);
	}
  },
  
  // PRIVATE
  processLoadedDataSourceItems: function(data_source_items, range) {
    // insert loaded elements in this.data_source_items,
    // and update this.loaded_start_index
    
    var oldNumberOfItems = this.data_source_items.length;
    
    if (this.data_source_items.length == 0) {
      this.data_source_items = data_source_items;
      this.loaded_start_index = range.location();
    } else {
      if (range.location() < this.loaded_start_index) {
        // items are prepended
        // XXX what happens if there is less items than what is expected?
        while (data_source_items.length){
          this.data_source_items.unshift(data_source_items.pop());
        }
        this.loaded_start_index = range.location();
      } else {
        // items are appended
        while (data_source_items.length)
          this.data_source_items.push(data_source_items.shift());
      }
    }
    
    
    // warn delegate of insertion
    
    if (this.delegate && this.delegate.dataSourceItemCollection_didUpdateDataSourceItem_atIndex) {
        range.each((function(index){
            this.delegate.dataSourceItemCollection_didUpdateDataSourceItem_atIndex(this, this.data_source_items[index - this.loaded_start_index], index);            
        }).bind(this));
    }
    
    // Now general delegation warning
    if ((this.data_source_items.length != oldNumberOfItems) && (this.delegate && this.delegate.dataSourceItemCollection_itemCountHasChanged)) {
      this.delegate.dataSourceItemCollection_itemCountHasChanged(this, this.data_source_items.length)
    }
    
    
  },
  
  // PRIVATE
  // Don't call when this.data_source_items is empty
  //
  // Returns the range of index that should be fetched next
  nextNeededDataSourceItemRange: function()
  {
    // contract says: "Don't call when this.data_source_items is empty"
    if (this.data_source_items.length == 0)
      return null;
    
    // return if no need
    if (this.needed_indexes.length == 0)
      return null;

    // pop required index from the FILO, until we got an unloaded item
    var index = this.needed_indexes.pop();
    while (index >= this.loaded_start_index && index < this.loaded_start_index + this.data_source_items.length) {
      if (this.needed_indexes.length == 0)
        return null;
      index = this.needed_indexes.pop();
    }
    
    var range = null;

    // CASE 1: If required item should be prepended, returns the minimum of all required indexes, and filter the FILO of needed indexes to higher ones.
    if (index < this.loaded_start_index) {
      var min_needed_index = index;
      var higher_indexes = new Array();
      for (var i = 0; i < this.needed_indexes.length; i++) {
        var needed_index = this.needed_indexes[i];
        if (needed_index < min_needed_index)
          min_needed_index = needed_index;
        else if (needed_index > index)
          higher_indexes.push(needed_index);
      }
      this.needed_indexes = higher_indexes;
      range = new MMT.Range(min_needed_index, this.loaded_start_index-min_needed_index);
      // extend it
      if(this.delegate.dataSourceItemCollection_bestRangeForRange){
        var newRange = this.delegate.dataSourceItemCollection_bestRangeForRange(this, range);
        if(newRange){
          // don't let the delegate extend the range beyond what we already have.  We ignore the max value
          range.setMinRange(newRange.location());
        }
        else{
          range = null;  // cancel request
        }
      }

    // CASE 2: If required item should be appended, returns the maximum of all required indexes, and filter the FILO of needed indexes to lower ones.
    } 
    else {
      var max_needed_index = index;
      var lower_indexes = new Array();
      for (var i = 0; i < this.needed_indexes.length; i++) {
        var needed_index = this.needed_indexes[i];
        if (needed_index > max_needed_index)
          max_needed_index = needed_index;
        else if (needed_index < index)
          lower_indexes.push(needed_index);
      }
      this.needed_indexes = lower_indexes;
      range = MMT.Range.makeRangeContainingIndices(this.loaded_start_index + this.data_source_items.length, max_needed_index);
      // extend it
      if(this.delegate.dataSourceItemCollection_bestRangeForRange){
        var newRange = this.delegate.dataSourceItemCollection_bestRangeForRange(this, range);
        if(newRange){
          // don't let the delegate extend the range beyond what we already have.  We ignore the min value.
          range.setMaxRange(newRange.maxRange());
        }
        else{
          range = null;  // cancel request
        }
      }
    }
    return range;
  }
});

/*  This class represent the model version of an Item in the collection.  We might want to add some behavior to it.  For 	
	the moment, this is just a bag.
*/

MMT.DataSourceItemCollection.SimpleItem = Class.create({
	initialize: function (options) {
		this.options = options;
	},
	html: function() {
		return this.options.html_value;
	},
	itemId: function() {
		return this.options.id;
	},
	dispose: function() {
		delete this.options;
		if(this.element && this.element.mmt_cleanup){
			this._element.mmt_cleanup();
		}
		delete this._element;
	},
	
  createDomElement: function() {
    if (this.options.html_value && this.options.html_value.length > 0) {
      var container = $(document.createElement('span'));
      Element.update(container, this.options.html_value);
      return  container.firstDescendant();
    }
    else{
      return null;
    }
  },
  
  allData: function() {
  	return this.options;
  },
	
	// PUBLIC: the DOM element associated to this model.
	element: function(){
		return this._element;
	},
	
	setElement: function(element){
		this._element = element;
	}
});

MMT.VoteController = Class.create({
  initialize: function (options) {
    this.options = {
      remaining_score: 0,
      remaining_nominate: 0,
      new_post_in_project_url: null // This is the prefix of the url used by photomodule_element when the user wants to create a discussion about the displayed pic in the project page reffered in this prefix.
    }
    Object.extend(this.options, options || {});
    
    this.remaining_score = this.options.remaining_score;
    this.remaining_nominate = this.options.remaining_nominate;
    this.new_post_in_project_url = this.options.new_post_in_project_url;
    
    this.prefetchAssets();
  },
  
  dispose:function() {
    
  },
  
  decrementRemainingScore: function() {
    this.remaining_score = this.remaining_score - 1;
  },
  
  incrementRemainingScore: function() {
    this.remaining_score = this.remaining_score + 1;
  },
  
  remainingScore: function() {
    return this.remaining_score;
  },
  
  decrementRemainingNominate: function() {
    this.remaining_nominate = this.remaining_nominate - 1;
  },
  
  incrementRemainingNominate: function() {
    this.remaining_nominate = this.remaining_nominate + 1;
  },
  
  remainingNominate: function() {
    return this.remaining_nominate;
  },
  
  url_for_new_post_in_project: function() {
    return this.new_post_in_project_url;
  },
  
  // protected
  prefetchAssets: function() {
    this.assets = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '-', '+'].map(function(character) {
      var image = new Image()
      image.src = MMT.VoteController.characterUrl(character);
      return image;
    }.bind(this));
  }
});

MMT.VoteController.characterUrl = function(character) {
  if (character == '-') character = 'minus';
  else if (character == '+') character = 'plus';
  
  return MMT.Assets.base_url+
         '/assets/web/photoModuleVoteOverlay/voteOvrlayFigure_'+
         character+
         '.png';
}

MMT.VoteController.QUOTA_SCORE_VOTE = 100;        // update ContextVote::QUOTA_SCORE_VOTE accordingly
MMT.VoteController.QUOTA_NOMINATE_VOTE = 50;      // update ContextVote::QUOTA_NOMINATE_VOTE accordingly
MMT.VoteController.CANDIDATE_SCORE_THRESHOLD = 1;
MMT.VoteController.DEFAULT_SCORE_THRESHOLD = 5;


// protocol for data_source:
// numberOfCarouselItems(MMT.Carousel): returns the number of items
// elementForCarousel_atIndex(MMT.Carousel, index): returns a HTML element
// carousel_willSetLeftMostRevealedItemIndex(MMT.Carousel, leftmost_item_index)  // the delegate can force the leftmost element index by implement this methiod
//
// protocol for delegate:
// carouselDidChangeRevealedItems(MMT.Carousel)
MMT.Carousel = Class.create({
  initialize:function(element_id, options) {
    this.options = {
      initial_leftmost_item_index: 0,
      page_item_count: 0,
      item_width: 0
    }
    Object.extend(this.options, options || {});

    // PUBLIC, R/O
    
    // delegate
    this.delegate = null;
    
    // data source
    this.data_source = null;
    
    // number of items
    this.item_count = 0;
    
    // number of items per page
    this.page_item_count = this.options.page_item_count;
    
    // the width of items
    this.item_width = this.options.item_width;
    
    
    // PRIVATE
    
    // the element holding all item elements
    this.element = $(element_id);
    
    // index of first item of the window
    this.window_start_index = this.options.initial_leftmost_item_index;
    
    // index of first loaded item
    this.loaded_start_index = 0;
    
    // number of loaded items
    this.loaded_item_count = 0;
    
    // items_container contains items
    this.items_container = $(document.createElement('div'));
    this.items_container.makePositioned();  // make sure scrollToWindowAnimated_onFinish works even on backward movements
    this.element.appendChild(this.items_container);
    
    // scrolling effect
    this.scrolling_effect = null;
  },
  
  // PUBLIC
  // sets the carousel delegate
  setDelegate: function(delegate)
  {
    this.delegate = delegate;
  },
  
  // PUBLIC
  // sets the carousel data source, and reload data
  setDataSource: function(data_source)
  {
    this.data_source = data_source;
  },
  
  awake: function()
  {
    this.reloadData();
  },
  
  // PUBLIC
  // Have the carousel refresh its data.
  // The revealed items indexes don't change, unless a change in item count requires they do.
  reloadData: function()
  {
    // drop all elements
    while (this.items_container.childNodes.length > 0) {
      this.items_container.removeChild(this.items_container.lastChild);
    }
    
    this.loaded_start_index = 0;
    this.loaded_item_count = 0;
    
    // reload number of items
    // dummy deploy
    this.item_count = this.data_source.numberOfCarouselItems(this);
    MMT.log('caroussel got ' + this.item_count);
    
    // go!
    if (this.page_item_count > 0) {
      this.setLeftmostRevealedItemIndex_animated(this.window_start_index, false);
      if (this.delegate && this.delegate.carouselDidChangeRevealedItems) {
        this.delegate.carouselDidChangeRevealedItems(this);
      }
    }
  },
  
  // PUBLIC
  // Have the carousel reveal the given page
  // (Honours absolute pagination)
  revealPage: function(page_index)
  {
    if (this.page_item_count <= 0) return;
    this.setLeftmostRevealedItemIndex_animated(page_index * this.page_item_count, true);
    if (this.delegate && this.delegate.carouselDidChangeRevealedItems) {
      this.delegate.carouselDidChangeRevealedItems(this);
    }
    
  },
  
  // PUBLIC
  // Shift revealed items by this.page_item_count
  // (Does not honour absolute pagination)
  revealPrevPage: function()
  {
    if (this.page_item_count <= 0) return;
    if (this.firstItemIsRevealed()) return;
    this.setLeftmostRevealedItemIndex_animated(this.window_start_index - this.page_item_count, true);
    if (this.delegate && this.delegate.carouselDidChangeRevealedItems) {
      this.delegate.carouselDidChangeRevealedItems(this);
    }
  },
  
  // PUBLIC
  // Shift revealed items by this.page_item_count
  // (Does not honour absolute pagination)
  revealNextPage: function()
  {
    if (this.page_item_count <= 0) return;
    if (this.lastItemIsRevealed()) return;
    this.setLeftmostRevealedItemIndex_animated(this.window_start_index + this.page_item_count, true);
    if (this.delegate && this.delegate.carouselDidChangeRevealedItems) {
      this.delegate.carouselDidChangeRevealedItems(this);
    }
  },
  
  // PUBLIC
  // The carousel will reveal items so that:
  // - the number of items is new_page_item_count
  // - the relative position of item at index reference_item_index is stable
  // (Does not honour absolute pagination)
  setPageItemCount_preservingRelativePositionOfItemAtIndex: function(new_page_item_count, reference_item_index)
  {
    if (this.page_item_count <= 0) {
      // update page_item_count
      this.page_item_count = new_page_item_count;
    } else {
      var relative_position_of_reference_item = (reference_item_index - this.window_start_index) / this.page_item_count;

      // update page_item_count
      this.page_item_count = new_page_item_count;

      // and window
      this.setLeftmostRevealedItemIndex_animated(reference_item_index - Math.round(this.page_item_count*relative_position_of_reference_item), false);
    }
    
    this.fitToContent();
    
    if (this.delegate && this.delegate.carouselDidChangeRevealedItems) {
      this.delegate.carouselDidChangeRevealedItems(this);
    }
  },
  
  // PUBLIC
  setCenterItemIndex_animated: function(index, animated)
  {
    if (this.page_item_count <= 0) return;
    this.setLeftmostRevealedItemIndex_animated(Math.ceil(index - this.page_item_count/2), animated);
    if (this.delegate && this.delegate.carouselDidChangeRevealedItems) {
      this.delegate.carouselDidChangeRevealedItems(this);
    }
  },
  
  
  // PUBLIC
  // Shift items so that item at index is revealed.
  // (Honours absolute pagination)
  revealItemAtIndex: function(index)
  {
    if (this.page_item_count <= 0) return;
    
    if (this.itemAtIndexIsRevealed(index)) {
      // item is already visible
      return;
    }
    
    this.setLeftmostRevealedItemIndex_animated(this.page_item_count * Math.floor(index / this.page_item_count), true);
    if (this.delegate && this.delegate.carouselDidChangeRevealedItems) {
      this.delegate.carouselDidChangeRevealedItems(this);
    }
  },
  
  
  // PUBLIC
  getLeftmostRevealedItemIndex: function() {
    return this.window_start_index;
  },
  
  
  // PUBLIC
  // Sets the leftmost revealed item.
  // (Does not honour absolute pagination)
  setLeftmostRevealedItemIndex_animated: function(new_window_start_index, animated) {
    if (this.page_item_count <= 0) return;

    // make sure new_window_start_index is valid
    if (new_window_start_index > this.item_count - 1) {
      new_window_start_index = this.item_count - 1;
    }
    if (new_window_start_index < 0) {
      new_window_start_index = 0;
    }
    
    // let delegate change index
    if (this.delegate && this.delegate.carousel_willSetLeftMostRevealedItemIndex) {
      new_window_start_index = this.delegate.carousel_willSetLeftMostRevealedItemIndex(this, new_window_start_index);
    }

    // GO !
    var end_index = Math.min(new_window_start_index + this.page_item_count, this.item_count);
    
    // 1. load new elements
    var wasNotEmpty = (this.loaded_item_count > 0);
    if (wasNotEmpty) {
      // load missing items before this.loaded_start_index
      for (index = this.loaded_start_index - 1;
           index >= new_window_start_index;
           index--) {
        var element = this.data_source.elementForCarousel_atIndex(this, index);
        this.items_container.insertBefore(element, this.items_container.firstChild);
      }
      
      // load missing items after this.loaded_start_index + this.loaded_item_count
      for (index = this.loaded_start_index + this.loaded_item_count;
           index < end_index;
           index++) {
        var element = this.data_source.elementForCarousel_atIndex(this, index);
        this.items_container.appendChild(element);
      }
      
      // update this.loaded_start_index && this.loaded_item_count
      var first_loaded_item_index = Math.min(this.loaded_start_index, new_window_start_index);
      var last_loaded_item_index = Math.max(this.loaded_start_index+this.loaded_item_count, end_index);

      this.loaded_start_index = first_loaded_item_index;
      this.loaded_item_count = last_loaded_item_index - first_loaded_item_index;

    } else {
      // load items
      for (index = new_window_start_index; index < end_index; index++) {
        var element = this.data_source.elementForCarousel_atIndex(this, index);
        this.items_container.appendChild(element);
      }

      // update this.loaded_start_index && this.loaded_item_count
      this.loaded_start_index = new_window_start_index;
      this.loaded_item_count = end_index - new_window_start_index;
    }
    
    // 2. place new elements
    this.placeElements();
    this.scrollToWindowAnimated_onFinish(false, null);
    
    // 3. prepare scrolling
    if (this.window_start_index < new_window_start_index) {
      this.showItemsFromIndex_toIndex(
        this.window_start_index,
        new_window_start_index + this.page_item_count);
    } else {
      this.showItemsFromIndex_toIndex(
        new_window_start_index,
        this.window_start_index + this.page_item_count);
    }
    
    // 4. update window_start_index
    this.window_start_index = new_window_start_index;
    
    // 5. scroll, animating if not previously empty
    this.scrollToWindowAnimated_onFinish(
      animated && wasNotEmpty,
      function() {
        this.showOnlyRevealedItems();
        this.fitToContent();
      }.bind(this));
  },
  
  
  // PUBLIC
  // returns true if item at index is revealed
  itemAtIndexIsRevealed: function(index)
  {
    if (this.page_item_count <= 0) return false;
    
    return (index >= 0 && index < this.item_count && index >= this.window_start_index && index < this.window_start_index + this.page_item_count);
  },
  
  // PUBLIC
  // Returns true if carousel reveals first item
  firstItemIsRevealed: function()
  {
    return this.itemAtIndexIsRevealed(0);
  },
  
  // PUBLIC
  // Returns true if carousel reveals last item
  lastItemIsRevealed: function()
  {
    return this.itemAtIndexIsRevealed(this.item_count - 1);
  },
  
  // PUBLIC
  // replace an element
  replaceElement_atIndex: function(element, index)
  {
    // can not replace non-existing element
    var actualElement = this.elementAtIndex(index);
    if (!actualElement)
      return;
      
    // show new element iff old element was visible
    element.style.display = actualElement.style.display;
    
    // replace old element
    Element.replace(actualElement, element);
    
    // place new element
    this.placeElementAtIndex(index);
  },
  
  // PRIVATE
  placeElements: function()
  {
    for (var index = this.loaded_start_index; index < this.loaded_start_index + this.loaded_item_count; index++) {
      this.placeElementAtIndex(index);
    }
  },
  
  // PRIVATE
  placeElementAtIndex: function(index)
  {
    var element = this.elementAtIndex(index);
    if (!element) return;
    element.style.left = ((index - this.loaded_start_index) * this.item_width) + "px";
  },
  
  // PRIVATE
  scrollToWindowAnimated_onFinish: function(animated, finish_handler) {
    if (animated) {
      if (this.scrolling_effect) {
        this.scrolling_effect.cancel();
      }
      
      this.scrolling_effect = new Effect.Move(
        this.items_container, {
        x: (this.loaded_start_index - this.window_start_index) * this.item_width,
        y: 0,
        mode: 'absolute',
        duration: 0.4,
        afterFinish: function() {
          this.scrolling_effect = null;
          if (finish_handler) finish_handler();
        }.bind(this)});

    } else {
      this.items_container.setStyle({left:((this.loaded_start_index - this.window_start_index) * this.item_width)+'px'})
    }
  },
  
  // PRIVATE
  showItemsFromIndex_toIndex: function(from_index, to_index)
  {
    var index;
    var element;
    
    for (index = this.loaded_start_index;
         index < from_index;
         index++) {
      element = this.elementAtIndex(index);
      if (element) Element.hide(element);
    }
    for (index = from_index;
         index < to_index
         && index < this.loaded_start_index + this.loaded_item_count;
         index++) {
      element = this.elementAtIndex(index);
      if (element) Element.show(element);
    }
    for (index = to_index;
         index < this.loaded_start_index + this.loaded_item_count;
         index++) {
      element = this.elementAtIndex(index);
      if (element) Element.hide(element);
    }
  },
  
  // PRIVATE
  fitToContent: function()
  {
    var displayed_item_count = Math.min(this.page_item_count, this.item_count);
    this.items_container.style.width = (displayed_item_count * this.item_width)+'px';
  },
  
  // PRIVATE
  showOnlyRevealedItems: function()
  {
    if (this.page_item_count <= 0) return;
    
    this.showItemsFromIndex_toIndex(
      this.window_start_index,
      this.window_start_index + this.page_item_count);
  },
  
  // PRIVATE
  elementAtIndex: function(index)
  {
    var internal_index = index - this.loaded_start_index;
    if (internal_index < 0 || internal_index > this.items_container.childNodes.length - 1)
      return null;
    return $(this.items_container.childNodes[internal_index]);
  }
  
});


Effect.Transitions.accelerating = function(pos) { return Math.sqrt(1 - (1 - pos)*(1 - pos)); }
Effect.Transitions.decelerating = function(pos) { return 1 - Math.sqrt(1 - pos*pos); }
Effect.Transitions.asinoidal = function(pos) { return 1-Math.acos(2*pos - 1)/Math.PI; }

MMT.PhotomoduleTransition = Class.create({
  initialize: function (photomodule, source_index, end_index) {
    this.photomodule = photomodule;
    this.source_index = source_index;
    this.end_index = end_index;
    this.effects = [];
    this.init();
    // window.console.log(this.toString()+": initialize");
  },
  
  toString: function() {
    return "PhotomoduleTransition("+this.source_index+","+this.end_index+")";
  },
  
  dispose: function() {
    // window.console.log(this.toString()+": dispose");
    this.cancel();
  },
  
  init: function() {
    this.started = false;
    this.finished = false;
    //
  },

  // Photomodule should use a MMT.PhotomoduleTransitionNone if user selects an Item before this delay
  cancel_delay: function() {
    return Math.max(0.4, this.duration/4);
  },
  
  start: function() {
    // window.console.log(this.toString()+": start");
    this.started = true;
    
    this.source_pane = null;
    var source_element = this.photomodule.photomoduleElementAtIndex(this.source_index);
    if (source_element) this.source_pane = $(source_element.getPane());
    
    var end_element = this.photomodule.photomoduleElementAtIndex(this.end_index);
    this.end_pane = $(end_element.getPane());
    
    this.run();
  },
  
  finish: function() {
    // window.console.log(this.toString()+": finish");
    if (!this.started) return;
    if (this.finished) return;
    this.finished = true;
    
    this.end_pane.setOpacity(1);
    this.end_pane.show();

    // // prevents a FF2-Mac flickering:
    // if (transition == 'none' && Prototype.Browser.Gecko && (navigator.userAgent.indexOf('Firefox/2') > -1)) {
    //   setTimeout(function() {
    //     this.didSelectElement(this.current_photomodule_element);
    //   }.bind(this), 10);
    // } else {
      var source_element = this.photomodule.photomoduleElementAtIndex(this.source_index);
      if (source_element) source_element.wasUndisplayed();
      this.photomodule.didSelectElementAtIndex(this.end_index);
    // }
  },
  
  run: function() {
  },
  
  cancel: function() {
    // window.console.log(this.toString()+": cancel");
    if (!this.started) return;
    if (this.finished) return;
    this.finished = true;
    
    if (this.effects) {
      this.effects.invoke('cancel');
      delete this.effects;
    }

    this.end_pane.setOpacity(1);
    this.end_pane.show();

    var source_element = this.photomodule.photomoduleElementAtIndex(this.source_index);
    if (source_element) source_element.wasUndisplayed();
  },
  
  rush_to_finish: function() {
    if (this.effects) {
      this.effects.invoke('cancel');
      delete this.effects;
    }
    
    this.finish();
  },
  
  isTransitionToNext: function()
  {
    var element_count = this.photomodule.photomoduleElementCount();
    if (element_count < 1) return false;
    
    return (((element_count + this.end_index - 1 - this.source_index) % element_count) == 0);
  },
  
  isTransitionToPrevious: function()
  {
    var element_count = this.photomodule.photomoduleElementCount();
    if (element_count < 1) return false;
    
    return (((element_count + this.source_index - 1 - this.end_index) % element_count) == 0);
  }
});

MMT.PhotomoduleTransitionNone = Class.create(MMT.PhotomoduleTransition, {
  init: function($super) {
    $super();
    this.duration = MMT.PhotomoduleTransitionNone.default_duration;
  },
  
  run: function() {
    this.finish();
  }
});
MMT.PhotomoduleTransitionNone.default_duration = 0;

MMT.PhotomoduleTransitionFade = Class.create(MMT.PhotomoduleTransition, {
  init: function($super) {
    $super();
    this.duration = MMT.PhotomoduleTransitionFade.default_duration;
  },
  
  run: function() {
    if (this.source_pane) {
      this.effects.push(
        new Effect.Parallel([
          new Effect.Opacity(
            this.source_pane, {
            sync: true,
            to: 0,
            transition: Effect.Transitions.accelerating }), 
          new Effect.Opacity(
            this.end_pane, {
            sync: true,
            to: 1,
            transition: Effect.Transitions.accelerating })], { 
          fps: 18,
          duration: this.duration,
          afterFinish: this.finish.bind(this)}));
    } else {
      this.effects.push(
        new Effect.Opacity(
          this.end_pane, {
          to: 1,
          transition: Effect.Transitions.accelerating,
          fps: 18,
          duration: this.duration,
          afterFinish: this.finish.bind(this)}));
    }
  }
});
MMT.PhotomoduleTransitionFade.default_duration = 2.5;

MMT.PhotomoduleTransitionFadeFast = Class.create(MMT.PhotomoduleTransitionFade, {
  init: function($super) {
    $super();
    this.duration = MMT.PhotomoduleTransitionFadeFast.default_duration;
  }
});
MMT.PhotomoduleTransitionFadeFast.default_duration = 1;

MMT.PhotomoduleTransitionSlide = Class.create(MMT.PhotomoduleTransition, {
  init: function($super) {
    $super();
    this.duration = MMT.PhotomoduleTransitionSlide.default_duration;
  },
  
  cancel_delay: function() {
    return Math.max(0.4, this.duration*0.7);
  }
});
MMT.PhotomoduleTransitionSlide.default_duration = 0.5;

MMT.PhotomoduleTransitionSlideLeft = Class.create(MMT.PhotomoduleTransitionSlide, {
  run: function() {
    if (this.source_pane) {
      this.effects.push(
        new Effect.Move(
          this.end_pane, {
          duration: 0,
          x: (this.photomodule.getImageWidth()+14),
          y: 0,
          afterFinish: function() {
            this.end_pane.setOpacity(1);
            this.effects.push(
              new Effect.Parallel([
                new Effect.Move(
                  this.source_pane, {
                  sync: true,
                  x: -(this.photomodule.getImageWidth()+14),
                  y: 0 }), 
                new Effect.Move(
                  this.end_pane, {
                  sync: true,
                  x: -(this.photomodule.getImageWidth()+14),
                  y: 0 })], { 
                duration: this.duration,
                afterFinish: this.finish.bind(this)}));
          }.bind(this)}));
    } else {
      this.effects.push(
        new Effect.Move(
          this.end_pane, {
          duration: 0,
          x: (this.photomodule.getImageWidth()+14),
          y: 0,
          afterFinish: function() {
            this.end_pane.setOpacity(1);
            this.effects.push(
              new Effect.Move(
                this.end_pane, {
                x: -(this.photomodule.getImageWidth()+14),
                y: 0,
                duration: this.duration,
                afterFinish: this.finish.bind(this)}));
          }.bind(this)}));
    }
  }
});

MMT.PhotomoduleTransitionSlideRight = Class.create(MMT.PhotomoduleTransitionSlide, {
  run: function() {
    if (this.source_pane) {
      this.effects.push(
        new Effect.Move(
          this.end_pane, {
          duration: 0,
          x: -(this.photomodule.getImageWidth()+14),
          y: 0,
          afterFinish: function() {
            this.end_pane.setOpacity(1);
            this.effects.push(
              new Effect.Parallel([
                new Effect.Move(
                  this.source_pane, {
                  sync: true,
                  x: (this.photomodule.getImageWidth()+14),
                  y: 0 }), 
                new Effect.Move(
                  this.end_pane, {
                  sync: true,
                  x: (this.photomodule.getImageWidth()+14),
                  y: 0 })], { 
                duration: this.duration,
                afterFinish: this.finish.bind(this)}));
          }.bind(this)}));
    } else {
      this.effects.push(
        new Effect.Move(
          this.end_pane, {
          duration: 0,
          x: -(this.photomodule.getImageWidth()+14),
          y: 0,
          afterFinish: function() {
            this.end_pane.setOpacity(1);
            this.effects.push(
              new Effect.Move(
                this.end_pane, {
                x: (this.photomodule.getImageWidth()+14),
                y: 0,
                duration: this.duration,
                afterFinish: this.finish.bind(this)}));
          }.bind(this)}));
    }
  }
});

MMT.PhotomoduleTransitionBlackFlash = Class.create(MMT.PhotomoduleTransition, {
  init: function($super) {
    $super();
    this.duration = MMT.PhotomoduleTransitionBlackFlash.default_duration;
  },
  
  cancel_delay: function() {
    return Math.min(0.4, this.duration);
  },
  
  run: function() {
    if (this.source_pane) {
      this.effects.push(
        new Effect.Opacity(
          this.source_pane, {
          duration: this.duration/2,
          to: 0,
          afterFinish: function() {
            this.effects.push(
              new Effect.Opacity(
                this.end_pane, {
                duration: this.duration/2,
                to: 1,
                afterFinish: this.finish.bind(this)}));
          }.bind(this)}));
    } else {
      this.effects.push(
        new Effect.Opacity(
          this.end_pane, {
          duration: this.duration/2,
          to: 1,
          afterFinish: this.finish.bind(this)}));
    }
  }
});
MMT.PhotomoduleTransitionBlackFlash.default_duration = 0.2;

MMT.PhotomoduleTransition.make = function(transition_name, photomodule, source_index, end_index) {
  switch(transition_name) {
  case 'none':
    return new MMT.PhotomoduleTransitionNone(photomodule, source_index, end_index);
  case 'fade':
    return new MMT.PhotomoduleTransitionFade(photomodule, source_index, end_index);
  case 'fade_fast':
    return new MMT.PhotomoduleTransitionFadeFast(photomodule, source_index, end_index);
  case 'slide_left':
    return new MMT.PhotomoduleTransitionSlideLeft(photomodule, source_index, end_index);
  case 'slide_right':
    return new MMT.PhotomoduleTransitionSlideRight(photomodule, source_index, end_index);
  case 'black_flash':
    return new MMT.PhotomoduleTransitionBlackFlash(photomodule, source_index, end_index);
  }
}

MMT.PhotomoduleTransition.default_duration = function(transition_name) {
  switch(transition_name) {
  case 'none':
    return MMT.PhotomoduleTransitionNone.default_duration;
  case 'fade':
    return MMT.PhotomoduleTransitionFade.default_duration;
  case 'fade_fast':
    return MMT.PhotomoduleTransitionFadeFast.default_duration;
  case 'slide':
  case 'slide_left':
  case 'slide_right':
    return MMT.PhotomoduleTransitionSlide.default_duration;
  case 'black_flash':
    return MMT.PhotomoduleTransitionBlackFlash.default_duration;
  }
}

// protocol for delegate:
// photomoduleElementPaneDidLoad(MMT.PhotomoduleElement)
// photomoduleElementPaneDidNotLoad(MMT.PhotomoduleElement)
// photomoduleElementThumbnailWasClicked(MMT.PhotomoduleElement)

MMT.PhotomoduleElement = Class.create({
  initialize: function (options) {
    this.options = {
      carousel_item_id: null,
      carousel_item_html: null
    }
    Object.extend(this.options, options || {});
    
    // public members
    this.photomodule = null;
    this.delegate = null;
    this.carousel_dom_element = $(this.options.carousel_item_id);
    
    // behaviors
    this.setupBehaviors();
  },
  
  kind: function() { return null },
  
  dispose: function() {
    this.stopPulsing();
    this.photomodule = null;
    this.delegate = null;
    if (this.carousel_dom_element) this.carousel_dom_element.stopObserving('click', this.onClickOnCarouselItem);
    delete this.options;
  },
  
  carouselDomElement: function() {
    if (!this.carousel_dom_element) {
      if (this.options.carousel_item_html && this.options.carousel_item_html.length > 0) {
        var container = document.createElement('span');
        Element.update(container, this.options.carousel_item_html);
        this.carousel_dom_element = $(container.firstChild);
      }
    }
    
    return this.carousel_dom_element;
  },

  loaded: function() {
    return false;
  },
  
  needsLoading: function() {
    return false;
  },
  
  load: function() {
  },
  
  getPane: function() {
    return null;
  },
  
  getAppearanceDuration: function() {
    return null;
  },
  
  getEntranceTransition: function() {
    return null;
  },
  
  getExitTransition: function() {
    return null;
  },
  
  setDelegate: function(delegate) {
    this.delegate = delegate;
  },
  
  setPhotomodule: function(photomodule) {
    this.photomodule = photomodule;
  },
  
  // protected
  setupBehaviors: function() {
    this.setupCarouselItemBehavior();
  },
  
  // protected
  setupCarouselItemBehavior: function() {
    var carousel_dom_element = this.carouselDomElement();
    if (carousel_dom_element) {
      this.onClickOnCarouselItem = this.clickOnCarouselItem.bindAsEventListener(this);
      carousel_dom_element.observe('click', this.onClickOnCarouselItem);
    }
  },
  
  // protected
  clickOnCarouselItem: function(event) {
    this.delegate.photomoduleElementThumbnailWasClicked(this);
  },
  
  // protected, friend method for MMT.Photomodule
  willBeUnselected: function() {
    if (this.carousel_dom_element) {
      this.carousel_dom_element.removeClassName("selected_photomodule_thumbnail");
    }
    this.stopPulsing();
  },
  
  // protected, friend method for MMT.Photomodule
  wasUndisplayed: function() {
  },
  
  // protected, friend method for MMT.Photomodule
  willBeSelected: function() {
    if (this.carousel_dom_element) {
      this.carousel_dom_element.addClassName("selected_photomodule_thumbnail");
    }
    this.startPulsingWithDelay(500); // 0.5 second before pulsing
  },
  
  // protected, friend method for MMT.Photomodule
  willDisplay: function() {
    this.stopPulsing();
  },
  
  // protected, friend method for MMT.Photomodule
  wasSelected: function() {
  },
  
  startPulsingWithDelay: function(delay) {
    if (this.pulsing) return;
    if (this.startPulsingTimeout) {
      clearTimeout(this.startPulsingTimeout);
      this.startPulsingTimeout = null;
    }
    this.startPulsingTimeout = setTimeout(function() {
      this.startPulsingTimeout = null;
      this.startPulsing();
    }.bind(this), delay);
  },
  
  // protected
  startPulsing: function() {
    // IE complains below, on Position.absolutize(this.loading_div). Don't know (yet ;-) how to fix.
    // Disable pulsing on IE (same initial test is done in stopPulsing)
    if (Prototype.Browser.IE) return;
    
    if (!this.carousel_dom_element) return;
    if (this.pulsing) return;
    this.pulsing = true;
    if (!this.loading_div) {
      this.loading_div = $(document.createElement('div'));
      this.loading_div.style.backgroundColor='white';
      this.carousel_dom_element.appendChild(this.loading_div);
      
      Position.absolutize(this.loading_div);
      Position.clone(this.carousel_dom_element.select('img')[0], this.loading_div);
    }
    this.loading_div.setOpacity(0);
    this.loading_div.show();
    this.pulseLoadingDiv();
  },
  
  // protected
  stopPulsing: function() {
    // IE complains in startPulsing.
    // Disable pulsing on IE (same initial test is done in startPulsing)
    if (Prototype.Browser.IE) return;
    
    if (!this.carousel_dom_element) return;
    if (this.startPulsingTimeout) {
      clearTimeout(this.startPulsingTimeout);
      this.startPulsingTimeout = null;
    }
    if (this.loading_div) this.loading_div.hide();
    if (this.pulsing_effects) this.pulsing_effects.invoke('cancel');
    this.pulsing = false;
  },
  
  // protected
  pulseLoadingDiv: function() {
    if (!this.pulsing_effects) this.pulsing_effects = [];
    this.pulsing_effects.invoke('cancel');
    this.pulsing_effects.clear();
    this.pulsing_effects.push(new Effect.Opacity(
      this.loading_div, {
      duration:0.35,
      to:0.3,
      afterFinish: function() {
        this.pulsing_effects.push(new Effect.Opacity(
          this.loading_div, {
          duration:0.35,
          to:0.05,
          afterFinish: function() {
            this.pulseLoadingDiv();
          }.bind(this)}));
      }.bind(this)}));
  }
});


if (Object.isUndefined(MMT.Assets)) throw("photomodule_element.js requires including assets.js library");
if (Object.isUndefined(MMT.PhotomoduleElement)) throw("photomodule_element_item.js requires including photomodule_element.js library");
if (Object.isUndefined(MMT.Image)) throw("photomodule.js requires including image.js library");

// debugging
// var balance = 0;

MMT.PhotomoduleElementItem = Class.create(MMT.PhotomoduleElement, {
  initialize: function($super, options) {
    photomodule_element_item_options = {
      item_id: null,
      item_url: null,
      in_context_item_url: null,
      item_title: null,
      image_src: null,
      image_low_res_src: null,
      author_caption: null,
      license_icons: null,
      license_text: null,
      license_url: null,
      see_also_links: null,
      user_vote: false,
      vote_url: false,
      fotopedia_scoring_context_url: null,
      score: null,
      status: 'default',
      medias: [],
      is_my_item: false
    }
    Object.extend(photomodule_element_item_options, options || {});
    $super(photomodule_element_item_options);
    
    this.item_id = this.options.item_id;
    this.item_url = this.options.item_url;
    this.in_context_item_url = this.options.in_context_item_url;
    this.item_title = this.options.item_title;
    this.is_my_item = this.options.is_my_item;
    this.reference_image = null;
    this.vote_controller = null;
    this.original_status = this.options.status;
    
    if (this.options.image_src) {
      this.reference_image = new MMT.Image(
        this.options.image_src, {
        onLoad: this.onImageLoad.bind(this),
        onError: this.onImageError.bind(this),
        onAbort: this.onImageAbort.bind(this)
        });
    } 
    
    if (this.options.license_url) {
     this.reference_image.license_url = this.options.license_url;
    }
    
    this.updateStatus();
    // window.console.log(this.toString()+" initialize");
  },
  
  toString: function() {
    return "PhotomoduleElementItem("+this.item_id+")";
  },
  
  setVoteController: function(vote_controller) {
    this.vote_controller = vote_controller;
  },

  get_item_id: function() {
	return this.item_id;
  },
  
  // FIXME: Horrible HACK
  // We need a way to choose, and load, the correct photo resolution,
  // I mean, we need to add support for multi-resolution images the *right* way.
  setPhotomodule: function($super, photomodule)
  {
    $super(photomodule);
    // load image with the resolution that fits screen, if HUD
    if (this.photomodule.options.image_sizing == 'hud') {
      var media = this.bestFitMediaFor({
        width: screen.width,
        height: screen.height,
        image_sizing: 'hud',
        low_res_device: false,
        magnetic_edge_distance: 0
      });

      if (media) {
        if (this.reference_image) {
          this.reference_image.dispose();
          delete this.reference_image;
        }

        this.reference_image = new MMT.Image(
          media.url, {
          onLoad: this.onImageLoad.bind(this),
          onError: this.onImageError.bind(this),
          onAbort: this.onImageAbort.bind(this)
          });
      }
    }
  },
  
  dispose: function($super) {
    $super();
    if (this.reference_image) {
      this.reference_image.dispose();
      delete this.reference_image;
    }
  },
  
  kind: function() { return 'item' },
  
  loaded: function() {
    if (!this.reference_image) return false;
    return this.reference_image.loaded;
  },
  
  needsLoading: function() {
    if (!this.reference_image) return false;
    return this.reference_image.needsLoading();
  },
  
  load: function($super) {
    $super();
    if (!this.reference_image) {
      return;
    }
    this.reference_image.load();
  },
  
  resizePane: function() {
    if (!this.pane) return;
    
    // recompute width and height
    var max_image_width = this.photomodule.getImageWidth();
    var max_image_height = this.photomodule.getImageHeight();
    var width_ratio = (max_image_width+0.0)/this.reference_image.width;
    var height_ratio = (max_image_height+0.0)/this.reference_image.height;
    var display_width = max_image_width;
    var display_height = max_image_height;
    
    var ratio_ratio = (this.reference_image.width/this.reference_image.height) / (max_image_width/max_image_height);
    var sizing = this.photomodule.options.image_sizing;
    
    // compute actual sizing
    
    if (sizing != 'hud') {
      // always distort when image's ratio is close to frame's ratio
      if (ratio_ratio > 0.98 && (1/ratio_ratio) > 0.98) {
        sizing = 'distort';
      } else {
        // some "meta-sizings" have to be converted to actual sizing
        switch (sizing) {

        case 'smart_sizing':
          var visible_ratio = ratio_ratio;
          if (visible_ratio > 1) visible_ratio = 1/visible_ratio;
          if (visible_ratio > 0.75) sizing = 'expand';
          else                      sizing = 'shrink';
          break;

        case 'slight_expand':
          if (ratio_ratio > 1 && (1/ratio_ratio) > 0.84) sizing = 'expand';
                                                    else sizing = 'shrink';
          break;
        }
      }
    }
    
    // apply actual sizing
    var ratio = null;
    switch (sizing) {
    case 'expand':
      ratio = 1;
      if (this.reference_image.height * width_ratio < max_image_height) {
        ratio = height_ratio;
      } else if (this.reference_image.width * height_ratio < max_image_width) {
        ratio = width_ratio;
      }
      break;
    case 'shrink':
      ratio = Math.max(width_ratio, height_ratio);
      if (this.reference_image.height * width_ratio > max_image_height) {
        ratio = height_ratio;
      } else if (this.reference_image.width * height_ratio > max_image_width) {
        ratio = width_ratio;
      }
      if (ratio > 1 && !this.photomodule.low_res_agent_mode) ratio = 1;
      break;
    case 'hud':
      // maximum ratio
      var maximum_ratio = 1;
      var maximumMediaDimensions = this.maximumMediaDimensions();
      
      ratio = maximumMediaDimensions.width / this.reference_image.width;
      if (ratio > maximum_ratio) maximum_ratio = ratio;
      ratio = maximumMediaDimensions.height / this.reference_image.height;
      if (ratio > maximum_ratio) maximum_ratio = ratio;
      
      // actual ratio
      ratio = Math.max(width_ratio, height_ratio);
      if (this.reference_image.height * width_ratio > max_image_height) {
        ratio = height_ratio;
      } else if (this.reference_image.width * height_ratio > max_image_width) {
        ratio = width_ratio;
      }
      if (ratio > maximum_ratio) ratio = maximum_ratio;
      break;
    case 'distort':
      break;
    }
    
    if (ratio) {
      // apply ratio
      display_width = Math.floor(this.reference_image.width * ratio);
      display_height = Math.floor(this.reference_image.height * ratio);
      
      // expand if photo is near edges, unless 'hud' sizing
      if (sizing != 'hud') {
        if (Math.abs(display_width - max_image_width) <= MMT.PhotomoduleElementItem.MAGNETIC_EDGE_DISTANCE) display_width = max_image_width;
        if (Math.abs(display_height - max_image_height) <= MMT.PhotomoduleElementItem.MAGNETIC_EDGE_DISTANCE) display_height = max_image_height;
      }
      
      // horizontal images have special display
      if (ratio_ratio > 1) {
        this.pane.addClassName('horizontal')
      } else {
        this.pane.removeClassName('horizontal')
      }
    }
    
    var margin_top = Math.floor((max_image_height - display_height)/2.0);
    var margin_left = Math.floor((max_image_width - display_width)/2.0);

    // apply !
    this.reference_image.image.style.width = display_width+'px';
    this.reference_image.image.style.height = display_height+'px';
    this.reference_image.image.style.top = margin_top+'px';
    this.reference_image.image.style.left = margin_left+'px';
  },
  
  getPane: function() {
    // KEEP IN SYNC WITH /app/views/shared/_photomodule.rhtml
    if (this.pane) return this.pane;
    if (!this.reference_image) return null;
    if (!this.reference_image.loaded) return null;
    
    //window.console.log(this.toString()+" getPane");
    
    // debugging
    // balance = balance + 1;
    // if (balance > 2) alert('bad balance !')
    
    this.pane = $(document.createElement('div'));
    this.pane.addClassName('picture_background')
    // this.pane.style.width = this.photomodule.getImageWidth()+'px';
    // this.pane.style.height = this.photomodule.getImageHeight()+'px';
    
    // Modification by ber on 20 sept 2009.
    // Instead of directly adding the image into the div, insert an <a> tag pointing to item url
    link = $(document.createElement('a'));
    if (this.photomodule.options.open_item_in_context && this.in_context_item_url != null && this.in_context_item_url != "") {
	  link.href = this.in_context_item_url;
    } else {
	  link.href = this.item_url;
    }
    this.pane.appendChild(link)
    link.appendChild(this.reference_image.image);
    // window.console.log(this.reference_image.toString()+" getPane");

    this.resizePane();
    
    this.photomodule.pane_container.appendChild(this.pane);
    Element.setOpacity(this.pane, 0);
    return this.pane;
  },
  
  // protected
  onImageLoad: function(image) {
    // image did succesfully load
    if (this.delegate) this.delegate.photomoduleElementPaneDidLoad(this);
  },
  
  // protected
  onImageError: function(image) {
    // image could not load (not found, this kind of error)
    
    var no_image_url = MMT.Assets.base_url+'/assets/blank-image.jpg';
    
    if (!this.reference_image || this.reference_image != no_image_url) {
      if (this.reference_image) {
        this.reference_image.dispose();
        delete this.reference_image;
      }
      
      // load blank default image instead
      this.reference_image = new MMT.Image(
        no_image_url, {
        onLoad: this.onImageLoad.bind(this),
        onError: this.onImageError.bind(this),
        onAbort: this.onImageAbort.bind(this)
        });
      this.reference_image.load();
    }
  },
  
  // protected
  onImageAbort: function(image) {
    // user cancelled the loading
    this.delegate.photomoduleElementPaneDidLoad(this);
  },
  
  // protected, friend method for MMT.Photomodule
  wasUndisplayed: function($super) {
    $super();
    if (this.pane) {
      // window.console.log(this.toString()+" wasUndisplayed");
      Element.remove(this.pane);
      this.pane = null;

      // be cool with devices with low cache
      if (this.photomodule && this.photomodule.low_memory_agent_mode && this.reference_image) this.reference_image.reset();
      
      // debugging
      // balance = balance - 1;
      // if (balance > 2) alert('bad balance !')
    }
  },
  
  // protected, friend method for MMT.Photomodule
  willDisplay: function($super) {
    $super();
    this.updateMetaData();
    this.updateVoteInterface();
    this.updateDetailsLinks();
    this.updateInappropriateLinks();
  },
  
  // protected
  updateMetaData: function() {
    // FIXME: bad API
    // actual purpose: have the delegate show or reveal the vote panel
    this.photomodule.setCurrentVote(this.options.score);
    // actual purpose: have the delegate show or reveal the see also panel
    this.photomodule.setSeeAlsoLinks(this.options.see_also_links);
    
    // OK:
    $('caption-author').update(this.options.author_caption);
    $('caption-license-icons').update(this.options.license_icons);
    $('caption-license-text').update(this.options.license_text);
  },
  
  // make sure status and score are related
  updateStatus:function() {
    if (this.options.status != 'candidate' && this.options.score < MMT.VoteController.CANDIDATE_SCORE_THRESHOLD) {
      this.options.status = 'tagged';
    } else {
        if (this.original_status == "veto") {
          this.options.status = this.original_status;
        } else if (this.options.score < MMT.VoteController.DEFAULT_SCORE_THRESHOLD) {
          this.options.status = 'candidate';
        } else {
          this.options.status = 'default';
        }
    }
  },
  
  registerVote: function(vote) {
    if (!this.vote_controller) return;
    if (!this.options.vote_url) return;
    
    // update model
    
    // user did vote
    this.feedback_mode = true;
    this.options.user_vote = vote;
    
    // score is changed
    var old_score = this.options.score;
    switch(vote) {
    case 'score:1':
    case 'score:+1':
      this.vote_controller.decrementRemainingScore();
      this.options.score = this.options.score + 1;
      pageTracker._trackEvent("Votes", "VoteUp", this.item_url);
      break;
    case 'score:-1':
      this.vote_controller.decrementRemainingScore();
      this.options.score = this.options.score - 1;
      pageTracker._trackEvent("Votes", "VoteDown", this.item_url);
      break;
    case 'nominate':
    case 'nominate:1':
    case 'nominate:+1':
      this.vote_controller.decrementRemainingNominate();
      this.options.score = Math.max(this.options.score, MMT.VoteController.CANDIDATE_SCORE_THRESHOLD);
      pageTracker._trackEvent("Votes", "Nominate", this.item_url);
      break;
    }
    this.updateStatus();
    
    // update view
    this.updateVoteInterface();
    
    // update server
    new Ajax.Request(
      this.options.vote_url+'&context_vote%5Bvalue%5D='+encodeURIComponent(vote), {
      method: 'post',
      onFailure: function () {
        // if server failed, restore model
        
        // user did not vote
        this.feedback_mode = false;
        this.options.user_vote = null;
        
        // restore score
        this.options.score = old_score;
        
        // restore quota
        switch(vote) {
        case 'score:1':
        case 'score:+1':
          this.vote_controller.incrementRemainingScore();
          break;
        case 'score:-1':
          this.vote_controller.incrementRemainingScore();
          break;
        case 'nominate':
        case 'nominate:1':
        case 'nominate:+1':
          this.vote_controller.incrementRemainingNominate();
          break;
        }
    
        // update view
        this.updateVoteInterface();
      }.bind(this)});
  },
  
  // protected
  updateVoteInterface: function() {
    var elements; // multi-purpose local
    
    // Declare view items
    var feedback_sentence = null;           // "Thanks for you vote", "Nominated!"
    var nominate_quota_sentence = null;     // "2 nominations left for today"
    var vote_quota_sentence = null;         // "30 votes left for today"
    var score_description_sentence = null;  // "9 votes to go for Fotopedia", "Woohoo! I'm in fotopedia now"
    var bottom_zone_class = null;           // 'nomination_about', 'nomination_exceeded', 'score_digits'
    var vote_panel_class = null;            // 'negative', 'tagged', 'candidate', 'default'
    var buttons_zone_class = null;          // 'nominate', 'vote', 'voted_up', 'voted_down'
    
    var status_sentence = null;             // compound
    var explanation_sentence = null;        // compound
    
    // Useful data
    var remaining_nominate;
    var remaining_score;
    
    if (this.vote_controller) {
      var url_for_post_in_project;
      
      remaining_nominate = this.vote_controller.remainingNominate();
      remaining_score = this.vote_controller.remainingScore();
      
      // update the add post url
      url_for_post_in_project = this.vote_controller.url_for_new_post_in_project();
      if (url_for_post_in_project) {
        var post_button;
        var element;
        
        url_for_post_in_project += "&new_post_picture_id=" + this.item_id.toString();
        
        this.photomoduleElementsByClassName('but_post_comment').each(function(element) {
          element.href = url_for_post_in_project;
        });
      }
    }
    
    
    // Build view items
    
    
    // feedback_sentence
    if (this.feedback_mode) {
      switch(this.options.user_vote) {
      case 'nominate':
      case 'nominate:1':
      case 'nominate:+1':
        feedback_sentence = 'Nominated!';
        break;
      default:
        feedback_sentence = 'Thanks for your vote!';
        break;
      }
    }
    
    
    // nominate_quota_sentence
    if (typeof(remaining_nominate) != typeof(null)) {
      if (remaining_nominate == 0) {
        nominate_quota_sentence = 'No nomination left for today';
      } else {
        if (remaining_nominate > 1) {
          nominate_quota_sentence = ''+remaining_nominate+' nominations left for today';
        } else {
          nominate_quota_sentence = ''+remaining_nominate+' nomination left for today';
        }
      }
    }
    
    
    // vote_quota_sentence
    if (typeof(remaining_score) != typeof(null)) {
      if (remaining_nominate == 0) {
        vote_quota_sentence = 'No vote left for today';
      } else {
        if (remaining_score > 1) {
          vote_quota_sentence = ''+remaining_score+' votes left for today';
        } else {
          vote_quota_sentence = ''+remaining_score+' vote left for today';
        }
      }
    }
    
    
    // score_description_sentence
    if (typeof(this.options.score) != typeof(null)) {
      switch (this.options.status) {
      case 'veto':
        score_description_sentence = 'This photo has been removed from the encyclopedia article';
        break;
      case 'candidate':
        var remaining_votes = MMT.VoteController.DEFAULT_SCORE_THRESHOLD - this.options.score;
        if (remaining_votes > 1) {
          score_description_sentence = ''+remaining_votes+' votes to go for the encyclopedia';
        } else {
          score_description_sentence = ''+remaining_votes+' vote to go for the encyclopedia';
        }
        break;
      case 'default':
        score_description_sentence = 'In the encyclopedia!';
        break;
      }
    }
    
    
    // bottom_zone_class (in ['nomination_about', 'nomination_exceeded', 'score_digits'])
    switch (this.options.status) {
    case 'tagged':
      if (this.original_status != 'tagged') {
        bottom_zone_class = 'score_digits';
      } else {
        if (typeof(remaining_nominate) != typeof(null)) {
          if (remaining_nominate > 0) {
            bottom_zone_class = 'nomination_about';
          } else {
            bottom_zone_class = 'nomination_exceeded';
          }
        } else {
          bottom_zone_class = 'nomination_about';
        }
      }
      break;
    case 'veto':
      bottom_zone_class = null;
      break;
    case 'candidate':
    case 'default':
      bottom_zone_class = 'score_digits';
      break;
    }
    
    
    // vote_panel_class (in ['negative', 'tagged', 'candidate', 'default'])
    if (typeof(this.options.score) != typeof(null)) {
      if (typeof(remaining_nominate) != typeof(null) && this.options.status == 'tagged' && remaining_nominate <= 0) {
        vote_panel_class = 'negative';
      } else  if (this.options.status == 'tagged') {
        vote_panel_class = 'tagged';
      } else  if (this.options.status == 'candidate') {
        vote_panel_class = 'candidate';
      } else if (this.options.status == 'veto') {
        vote_panel_class = 'veto';
      } else {
        vote_panel_class = 'default';
      }
    }
    
    if (!this.original_vote_panel_class) {
      this.original_vote_panel_class = vote_panel_class;
    }
    
    
    // buttons_zone_class (in ['nominate', 'vote', 'voted_up', 'voted_down'])
    switch (this.options.status) {
    case 'tagged':
      if (this.original_status != 'tagged') {
        buttons_zone_class = 'voted_down';
      } else {
        buttons_zone_class = 'nominate';
      }
      break;
    case 'candidate':
    case 'default':
      if (this.feedback_mode) {
        switch(this.options.user_vote) {
        case 'nominate':
        case 'nominate:1':
        case 'nominate:+1':
          buttons_zone_class = 'nominate';
          break;
        case 'score:1':
        case 'score:+1':
          buttons_zone_class = 'voted_up';
          break;
        case 'score:-1':
          buttons_zone_class = 'voted_down';
          break;
        default:
          buttons_zone_class = 'vote';
          break;
        }
      } else {
        switch(this.options.user_vote) {
        case 'score:1':
        case 'score:+1':
        case 'nominate':
        case 'nominate:1':
        case 'nominate:+1':
          buttons_zone_class = 'voted_up';
          break;
        case 'score:-1':
          buttons_zone_class = 'voted_down';
          break;
        default:
          buttons_zone_class = 'vote';
          break;
        }
      }
      break;
    }
    
    
    // status_sentence
    if (feedback_sentence) {
      status_sentence = feedback_sentence;
    } else if (this.options.status == 'veto') {
      status_sentence = '';
    } else if (this.options.user_vote) {
      status_sentence = 'You already voted for this photo';
    } else if (this.options.status == 'tagged') {
      status_sentence = nominate_quota_sentence;
    } else {
      status_sentence = vote_quota_sentence;
    }
    
    // explanation_sentence
    explanation_sentence = score_description_sentence;
    
    
    
    
    // update the view
    
    // source url
    if (this.vote_controller) {
      var source_url;
      switch(this.options.status) {
      case 'veto':
        source_url = null;
        break;
      case 'candidate':
        source_url = this.vote_controller.options.candidates_fotopedia_scoring_context_url;
        break;
      default:
        source_url = this.vote_controller.options.fotopedia_scoring_context_url;
        break;
      }
      
      this.photomoduleElementsByClassName('vote_context_name').each(function(element) {
        $A(element.getElementsByTagName('a')).each(function(element) {
          element.href = source_url;
        })
      });
    }
    
    
    // consume status_sentence
    this.photomoduleElementsByClassName('status_sentence').each(function(element) {
      while (element.childNodes.length > 0) element.removeChild(element.lastChild);
      if (status_sentence)
        element.appendChild(document.createTextNode(status_sentence));
    });
    
    
    // consume explanation_sentence
    this.photomoduleElementsByClassName('explanation_sentence').each(function(element) {
      while (element.childNodes.length > 0) element.removeChild(element.lastChild);
      if (explanation_sentence)
        element.appendChild(document.createTextNode(explanation_sentence));
    });
    
    
    // consume bottom_zone_class
    this.photomoduleElementsByClassName('bottom_zone').each(function(element) {
      element.removeClassName('nomination_about');
      element.removeClassName('nomination_exceeded');
      element.removeClassName('score_digits');
      if (typeof(bottom_zone_class) != typeof(null)) {
        element.addClassName(bottom_zone_class);
      }
    });

    if (bottom_zone_class == 'score_digits' && typeof(this.options.score) != typeof(null)) {
      // score digits
      
      // split score into characters
      var score_string = ''+this.options.score;
      if (this.options.score > 0) { score_string = '+'+score_string; }
      var score_characters = score_string.split('');
      // convert each characters into images
      this.photomoduleElementsByClassName('score').each(function(element) {
        // clear, update content, and reveal
        while (element.childNodes.length > 0) element.removeChild(element.lastChild);
        score_characters.each(function(character) {
          element.appendChild(new Element( 'img', { src: MMT.VoteController.characterUrl(character)}));
        });
        element.show();
      });
    } else {
      this.photomoduleElementsByClassName('score').each(function(element) {
        // clear, hide
        while (element.childNodes.length > 0) element.removeChild(element.lastChild);
        element.hide();
      });
    }
    
    // consume vote_panel_class && this.original_vote_panel_class
    this.photomoduleElementsByClassName('vote_panel').each(function(element) {
      element.removeClassName('veto');
      element.removeClassName('negative');
      element.removeClassName('tagged');
      element.removeClassName('candidate');
      element.removeClassName('default');
      if (typeof(vote_panel_class) != typeof(null)) {
        element.addClassName(vote_panel_class);
      }

      element.removeClassName('original_veto');
      element.removeClassName('original_negative');
      element.removeClassName('original_tagged');
      element.removeClassName('original_candidate');
      element.removeClassName('original_default');
      if (typeof(this.original_vote_panel_class) != typeof(null)) {
        element.addClassName('original_'+this.original_vote_panel_class);
      }
    }.bind(this));
    
    
    // consume buttons_zone_class
    this.photomoduleElementsByClassName('buttons_zone').each(function(element) {
      element.removeClassName('nominate');
      element.removeClassName('vote');
      element.removeClassName('voted_up');
      element.removeClassName('voted_down');
      if (typeof(buttons_zone_class) != typeof(null)) {
        element.addClassName(buttons_zone_class);
      }
    });
    
    
    
    // show/hide vote buttons
    
    var voteDownButtons = this.photomoduleElementsByClassName('but_vote_down');
    var voteUpButtons = this.photomoduleElementsByClassName('but_vote_up');
    var voteNominateButtons = this.photomoduleElementsByClassName('but_vote_nominate');
    
    if (this.feedback_mode) {
      switch(this.options.user_vote) {
      case 'nominate':
      case 'nominate:1':
      case 'nominate:+1':
        voteDownButtons.invoke('hide');
        voteUpButtons.invoke('hide');
        voteNominateButtons.invoke('show');
        break;
      default:
        voteDownButtons.invoke('show');
        voteUpButtons.invoke('show');
        voteNominateButtons.invoke('hide');
        break;
      }
    } else {
      switch(this.options.status) {
      case 'tagged':
        voteDownButtons.invoke('hide');
        voteUpButtons.invoke('hide');
        voteNominateButtons.invoke('show');
        break;
      case 'veto':
        voteDownButtons.invoke('hide');
        voteUpButtons.invoke('hide');
        voteNominateButtons.invoke('hide');
        break;
      case 'candidate':
      case 'default':
        voteDownButtons.invoke('show');
        voteUpButtons.invoke('show');
        voteNominateButtons.invoke('hide');
        break;
      }
    }
    
    
    // enable/disable vote buttons
    
    var voteButtonsProcessed = false;
    var nominateButtonsProcessed = false;
    var userCanVote = false;
    
    if (this.is_my_item) { // bug 1745
      
      var eachF = function(button) {
        button.onclick = function(event) {
          alert("You cannot vote for your photo.");
          return false;
        }
        button.addClassName('disabled');
      }
      
      voteDownButtons.each(eachF);
      voteUpButtons.each(eachF);
      voteButtonsProcessed = true;
      
    } else if (this.options.user_vote) {
      
      var eachF = function(button) {
        button.onclick = function(event) {
          alert("You've already voted for this photo.");
          return false;
        }
        button.addClassName('disabled');
      }
      
      voteDownButtons.each(eachF);
      voteUpButtons.each(eachF);
      voteButtonsProcessed = true;
      
      voteNominateButtons.each(eachF);
      nominateButtonsProcessed = true;
    }
    
    switch(this.options.status) {
    case 'tagged':
    
      if (typeof(remaining_nominate) != typeof(null)) {
        if (!nominateButtonsProcessed) {
          if (remaining_nominate > 0) {

            voteNominateButtons.each(function(button) {
              button.removeClassName('disabled');
              button.onclick = function(event) {
                this.registerVote('nominate');
                return false;
              }.bindAsEventListener(this);
            }.bind(this));
            
            userCanVote = true;

          } else {

            voteNominateButtons.each(function(button) {
              button.onclick = function(event) {
                alert("You've run out of your "+MMT.VoteController.QUOTA_NOMINATE_VOTE+" daily nominations. Try again tomorrow.");
                return false;
              }
              button.addClassName('disabled');
            });

          }
          
          nominateButtonsProcessed = true;
        }
      } else {
        userCanVote = true; // nominate button opens a login dialog
      }
      
      if (!voteButtonsProcessed) {
        if (typeof(remaining_score) != typeof(null)) {
          voteDownButtons.each(function(button) {
            button.onclick = function(event) { return false; }
            button.addClassName('disabled');
          }.bind(this));

          voteUpButtons.each(function(button) {
            button.onclick = function(event) { return false; }
            button.addClassName('disabled');
          }.bind(this));
        }
      }
      break;
      
    case 'candidate':
    case 'default':
    
      if (typeof(remaining_nominate) != typeof(null)) {
        if (!nominateButtonsProcessed) {
          voteNominateButtons.each(function(button) {
            button.onclick = function(event) { return false; }
            button.addClassName('disabled');
          }.bind(this));
          nominateButtonsProcessed = true;
        }
      } else {
        userCanVote = true; // nominate button opens a login dialog
      }

      if (typeof(remaining_score) != typeof(null)) {
        if (!voteButtonsProcessed) {
          if (remaining_score > 0) {
          
            voteDownButtons.each(function(button) {
              button.removeClassName('disabled');
              button.onclick = function(event) {
                this.registerVote('score:-1');
                return false;
              }.bindAsEventListener(this);
            }.bind(this));

            voteUpButtons.each(function(button) {
              button.removeClassName('disabled');
              button.onclick = function(event) {
                this.registerVote('score:1');
                return false;
              }.bindAsEventListener(this);
            }.bind(this));
          
            userCanVote = true;
            
          } else {
          
            voteDownButtons.each(function(button) {
              button.onclick = function(event) {
                alert("You've run out of your "+MMT.VoteController.QUOTA_SCORE_VOTE+" daily votes. Try again tomorrow.");
                return false;
              }
              button.addClassName('disabled');
            });

            voteUpButtons.each(function(button) {
              button.onclick = function(event) {
                alert("You've run out of your "+MMT.VoteController.QUOTA_SCORE_VOTE+" daily votes. Try again tomorrow.");
                return false;
              }
              button.addClassName('disabled');
            });
          
          }
          voteButtonsProcessed = true;
        }
      } else {
        userCanVote = true; // vote buttons open a login dialog
      }
      break;
    }
    
    if (userCanVote) {
      this.photomoduleElementsByClassName('vote_panel').each(function(element) {
        element.removeClassName('user_can_not_vote');
        element.addClassName('user_can_vote');
      });
    } else {
      this.photomoduleElementsByClassName('vote_panel').each(function(element) {
        element.removeClassName('user_can_vote');
        element.addClassName('user_can_not_vote');
      });
    }
  },
  
  // PRIVATE
  updateDetailsLinks: function() {
    // update HUD button link
    this.photomoduleElementsByClassName('but_details').each(function(details_button) {
      // reveal button
      Element.show(details_button);

      // enable/disable button, and update its links
      if (this.item_url) {
        details_button.href = this.item_url;
        details_button.removeClassName('disabled');
      } else {
        details_button.href = '#';
        details_button.addClassName('disabled');
      }
    }.bind(this))
  },
  
  // PRIVATE
  updateInappropriateLinks: function() {
    // update HUD button link
    this.photomoduleElementsByClassName('but_inappropriate').each(function(details_button) {
      // reveal button
      Element.show(details_button);

      // enable/disable button, and update its links
      if (this.item_url) {
        details_button.href = this.item_url + '/abuse_reports/new';
        details_button.removeClassName('disabled');
      } else {
        details_button.href = '#';
        details_button.addClassName('disabled');
      }
    }.bind(this))
  },
  
  // PRIVATE
  maximumMediaDimensions: function() {
    if (!this._maximumMediaDimensions) {
      var width = 0;
      var height = 0;
      
      if (this.options.medias && this.options.medias.length > 0) {
        for (var i=0; i < this.options.medias.length; i++) {
          var media = this.options.medias[i];
          if (media.width > width) {
            width = media.width;
            height = media.height;
          }
        }
      }
      
      this._maximumMediaDimensions = {
        width: width,
        height: height }
    }
    
    return this._maximumMediaDimensions;
  },
  
  // PUBLIC
  // This method is a clone of the Item#best_fit_media_for method.
  bestFitMediaFor: function(options) {
    if (!this.options.medias || this.options.medias.length <= 0) {
      return null;
    }
    
    var actual_options = {
      magnetic_edge_distance: 0,
      image_sizing: 'shrink',
      low_res_device: false
    }
    Object.extend(actual_options, options || {});
    options = actual_options;
    
    if (options.low_res_device) {
      options.width = Math.min(options.width, 320);
      options.height = Math.min(options.height, 320);
    }

    var conditions = [];
    if (options.width && options.width > 0) {
      conditions.push(function(media) {
        return (media.width + options.magnetic_edge_distance) >= options.width;
      });
    }
    if (options.height && options.height > 0) {
      conditions.push(function(media) {
        return (media.height + options.magnetic_edge_distance) >= options.height;
      });
    }
    
    var candidate_medias = [];
    
    // dimensions caping
    switch(options.image_sizing) {
    case 'shrink':
    case 'hud':
    case 'slight_expand':
    case 'smart_sizing':
      candidate_medias = this.options.medias.findAll(function(media) {
        return conditions.any(function(condition) {
          return condition(media);
        });
      });
      break;
    case 'expand':
    case 'distort':
      candidate_medias = this.options.medias.findAll(function(media) {
        return conditions.all(function(condition) {
          return condition(media);
        });
      });
      break;
    default:
      return null;
    }
    
    if (candidate_medias.length == 0) {
      // damned! no candidate
      if (options.low_res_device) {
        // medium should fit
        return this.mediaFor('medium');
      } else {
        if (options.image_sizing == 'hud') {
          // biggest image for HUD
          return this.options.medias.sortBy(function(media) { return media.width }).last();
        } else {
          // image is a good general fit
          return this.mediaFor('image');
        }
      }
    }
    
    // return smallest candidate
    return candidate_medias.sortBy(function(media) { return media.width }).first();
  },
  
  // PUBLIC
  // This method is a clone of the Item#media_for method.
  mediaFor: function(kind) {
    if (!this.options.medias || this.options.medias.length <= 0) {
      return null;
    }
    
    return this.options.medias.detect(function(media) { return media.kind == kind });
  },
  
  photomoduleElementsByClassName: function(className) {
    return $A(this.photomodule.element.getElementsByClassName(className));
  }
})

MMT.PhotomoduleElementItem.MAGNETIC_EDGE_DISTANCE = 4;


if (Object.isUndefined(MMT.Assets)) throw("photomodule.js requires including assets.js library");
if (Object.isUndefined(MMT.PhotomoduleElementItem)) throw("photomodule.js requires including photomodule_element_item.js library");
if (Object.isUndefined(MMT.Carousel)) throw("photomodule.js requires including carousel.js library");
if (Object.isUndefined(MMT.PhotomoduleTransition)) throw("photomodule.js requires including photomodule_transitions.js library");
if (Object.isUndefined(MMT.VoteController)) throw("photomodule.js requires including vote_controller.js library");
// if (Object.isUndefined(MMT.KenBurns)) throw("photomodule.js requires including ken_burns.js library");


// Need a repository of instances in order to avoid some memory leaks
MMT.Photomodules = {
  photomodules: [],
  minimum_delay_since_last_user_interaction_meaning_user_is_passive: 8000,  // 8 seconds
  
  // CALL THIS METHOD BEFORE REMOVING A PHOTOMODULE ELEMENT !
  remove: function(element) {
    element = $(element);
    this.photomodules = this.photomodules.reject(function(photomodule) {
      if (photomodule.element == element) {
        photomodule.dispose();
        return true;
      }
      return false;
    });
  },
  
  // protected, friend method for MMT.Photomodule
  add: function(photomodule) {
    this.photomodules.push(photomodule);
    return this;
  },
  
  find: function(element) {
    element = $(element);
    result = this.photomodules.find(function(photomodule) { return photomodule.element == element; });
    return result;
  },
  
  each: function(iterator, context) {
    this.photomodules.each(iterator, context);
    return this;
  }
}

MMT.Photomodule = Class.create({
  initialize: function (element, options) {
    MMT.Photomodules.add(this);

    this.options = {
      image_width: null,
      image_height: null,
      image_sizing: 'shrink',
      carousel_displayed: true,
      carousel_item_width: null,
      carousel_page_item_count: null,
      selected_item_index: 0,
	  selected_item_id: null,
      data_source_item_collection: null, // an instance of MMT.DataSourceItemCollection
      slideshow_auto_play: false,
      slideshow_delay: 6,
      slideshow_loop: false,
      slideshow_transition: 'fade',
      hud_base_url: null,
      on_display_current_element: function(index) {},
      open_item_in_context: false,
      cc_only: false
    }
    Object.extend(this.options, options || {});

    // public, read-only members
    this.element = $(element);
    // the zones
    this.image_and_strips_element = this.element.getElementsByClassName('image_and_strips')[0];
    this.pane_container = this.element.getElementsByClassName('pane_container')[0];
    this.see_also_links_element = $('see_also');  // TODO: don't use id
    this.vote_panel_element = this.element.getElementsByClassName('vote_panel')[0];
    this.top_strip_element = $('topstrip');  // TODO: don't use id
    this.mod_strip_element = $('modstrip');  // TODO: don't use id
    
    this.selected_index = -1;
    this.last_selected_index = -1;
    this.last_displayed_index = -1;
    this.playing = this.options.slideshow_auto_play;
    this.suspended = false;
    this.suspended_selection_options = null;
    // if slow_agent_mode is true, photomodule will be kind with slow devices
    this.slow_agent_mode = (Prototype.Browser.WebKit && (navigator.userAgent.indexOf('Mobile') > -1)) || (navigator.userAgent.indexOf('MSIE 6') > -1);
    // if low_memory_agent_mode is true, photomodule will be kind with devices that don't have much cache
    this.low_memory_agent_mode = Prototype.Browser.WebKit && (navigator.userAgent.indexOf('Mobile') > -1);
    // if low_res_agent_mode is true, photomodule will be kind with devices that don't have much screen estate
    this.low_res_agent_mode = screen && screen.width && screen.width < 500;

    // should we really do the transition ?
    if (this.slow_agent_mode) {
      switch(this.options.slideshow_transition) {
      case 'slide_left':
      case 'slide_right':
      case 'fade':
      case 'fade_fast':
        // don't fade nor slide on slow devices
        this.options.slideshow_transition = 'none';
        break;
      }
    }
    
    // protected members
    this.current_selection_options = null;
    this.last_element_selection_date = -1;
    this.delay_since_last_element_selection_date = -1;
    this.last_user_interaction_date = -1;
    
    
    // initialize the data_source_item_collection
    this.data_source_item_collection = this.options.data_source_item_collection;
    this.data_source_item_collection.setDelegate(this); // not very polite, FIXME: this delegation should be done by the data_source creator
    
    // initialize the carousel
    this.carousel = new MMT.Carousel(
      this.element.getElementsByClassName('carousel')[0], {
      page_item_count: this.options.carousel_page_item_count,
      item_width: this.options.carousel_item_width});
    this.carousel.setDelegate(this);
    this.carousel.setDataSource(this);
    this.carousel.awake();
    
    
    // the play/stop buttons
    this.buts_slideshow_play = $A(this.element.getElementsByClassName('but_slideshow_play')).map(function(element) {
      return new MMT.Photomodule.ButtonSlideShowPlay(this, element);
    }.bind(this));
    this.buts_slideshow_stop = $A(this.element.getElementsByClassName('but_slideshow_stop')).map(function(element) {
      return new MMT.Photomodule.ButtonSlideShowStop(this, element);
    }.bind(this));
    
    // vote
    if (this.options.vote) {
      this.vote_controller = new MMT.VoteController(this.options.vote);
    } else {
      this.vote_controller = null;
    }
    this.current_vote = null;
    
    // behaviors
    this.setupBehaviors();
    
    // select first element
    var initial_selected_index = this.options.selected_item_index;
    if (initial_selected_index > this.data_source_item_collection.dataSourceItemCount()-1)
      initial_selected_index = this.data_source_item_collection.dataSourceItemCount()-1;
    if (initial_selected_index < 0)
      initial_selected_index = 0;
    this.setSelectedIndex(
      initial_selected_index, {
      user_driven_selection: false});
    
    
    // Bug 1539 fix: don't vanish overlay while select box is opened
    this.bugfix1539()
  },
  
  bugfix1539: function(){
    var sel = $('photomodule_arranged_album_items_sort')
    
    if (!sel) return // we are possibly in the fullscreen: nothing to fix in this case
    
    var self     = this
    var doc      = $(document.body)
    var el       = this.element
    var el2      = this.image_and_strips_element
    var elhandle = this.onHandleMouseEvent
    
    var toggleObservationWith = function(func){
      el[func]('mouseover', elhandle);
      el[func]('mouseout',  elhandle);
      if (el2) {
        el2[func]('mouseover', elhandle);
        el2[func]('mouseout',  elhandle);
      }
    }
  
    // this var is needed to surpress any event collisions which might happen
    var mouseObservingState = true
    
    var handlers = {}
        
    var unfreezeOnDocClickLaterID = null
    var unfreezeOnDocClickLater = function() {
      if (unfreezeOnDocClickLaterID) clearTimeout(unfreezeOnDocClickLaterID)
      doc.observe('click', handlers.unfreeze)
    }
    handlers['freeze'] = function(e){
      sel.stopObserving('click', handlers.freeze)
      
      if (mouseObservingState) // observe once
      {
        mouseObservingState = false
        toggleObservationWith("stopObserving")
        sel.observe('click', handlers.unfreeze)
        unfreezeOnDocClickLaterID = setTimeout(unfreezeOnDocClickLater, 100)
      }
    }
    handlers['unfreeze'] = function(e){
      sel.stopObserving('click', handlers.unfreeze)
      doc.stopObserving('click', handlers.unfreeze)

      if (!mouseObservingState) // observe once
      {
        mouseObservingState = true
        toggleObservationWith("observe")
        elhandle(e) // trigger the event for smoother experience
        sel.observe('click', handlers.freeze)
      }
    }
    
    sel.observe('click', handlers.freeze)
  },
  
  dispose: function() {
    this.disable();
    
    if (this.vote_controller) {
      this.vote_controller.dispose();
      delete this.vote_controller;
    }

    this.element.stopObserving('mouseover', this.onHandleMouseEvent);
    this.element.stopObserving('mouseout', this.onHandleMouseEvent);

    if (this.image_and_strips_element) {
      this.image_and_strips_element.stopObserving('mouseover', this.onHandleMouseEvent);
      this.image_and_strips_element.stopObserving('mouseout', this.onHandleMouseEvent);
    }
    
    $A(this.element.getElementsByClassName('but_carousel_next_page')).invoke('stopObserving', 'click', this.onRevealNextPage);
    $A(this.element.getElementsByClassName('but_carousel_prev_page')).invoke('stopObserving', 'click', this.onRevealPrevPage);
    $A(this.element.getElementsByClassName('but_photomodule_next')).invoke('stopObserving', 'click', this.onRevealNextImage);
    $A(this.element.getElementsByClassName('but_photomodule_prev')).invoke('stopObserving', 'click', this.onRevealPrevImage);
    
    this.buts_slideshow_play.invoke('dispose');
    delete this.buts_slideshow_play;

    this.buts_slideshow_stop.invoke('dispose');
    delete this.buts_slideshow_stop;
    
    // TODO obsolete code to revert: this.elements.invoke('dispose');
    // delete this.elements;
    
    // Object.values(this.carousels).invoke('dispose');
    // delete this.carousels;
    
    if (this.current_transition) {
      this.current_transition.dispose();
      delete this.current_transition;
    }
    
    this.cancelDelayedSelection();
    
    delete this.options;
  },

  enable: function() {
    if (Prototype.Browser.WebKit) {
      document.stopObserving('keydown', this.onKeyDown);
      document.observe('keydown', this.onKeyDown);
    } else {
      document.stopObserving('keypress', this.onKeyDown);
      document.observe('keypress', this.onKeyDown);
    }
    this.data_source_item_collection.awake();
  },
  
  disable: function() {
    if (Prototype.Browser.WebKit) {
      document.stopObserving('keydown', this.onKeyDown);
    } else {
      document.stopObserving('keypress', this.onKeyDown);
    }
  },
  
  getImageWidth: function() {
    return this.options.image_width;
  },
  
  getImageHeight: function() {
    return this.options.image_height;
  },
  
  // protected
  setupBehaviors: function() {
    this.onKeyDown = this.handleKeyDown.bindAsEventListener(this);
    this.onHandleMouseEvent = this.handleMouseEvent.bindAsEventListener(this);
    this.onRevealNextPage = this.revealNextPageInResponseToUserAction.bindAsEventListener(this);
    this.onRevealPrevPage = this.revealPrevPageInResponseToUserAction.bindAsEventListener(this);
    this.onRevealNextImage = this.revealNextImageInResponseToUserAction.bindAsEventListener(this);
    this.onRevealPrevImage = this.revealPrevImageInResponseToUserAction.bindAsEventListener(this);
    
    // FIXME: remove hard references to 'modstrip' && 'topstrip' elements
    var modstrip = $('modstrip');
    if (modstrip) {
      modstrip.setOpacity(0);
      modstrip.show();
    }

    if (this.top_strip_element) {
      this.top_strip_element.setOpacity(0);
      this.top_strip_element.show();
    }

    this.setCarouselDisplayed(this.options.carousel_displayed);

    this.element.observe('mouseover', this.onHandleMouseEvent);
    this.element.observe('mouseout', this.onHandleMouseEvent);
    
    if (this.image_and_strips_element) {
      this.image_and_strips_element.observe('mouseover', this.onHandleMouseEvent);
      this.image_and_strips_element.observe('mouseout', this.onHandleMouseEvent);
    }
    
    $A(this.element.getElementsByClassName('but_carousel_next_page')).invoke('observe', 'click', this.onRevealNextPage);
    $A(this.element.getElementsByClassName('but_carousel_prev_page')).invoke('observe', 'click', this.onRevealPrevPage);
    $A(this.element.getElementsByClassName('but_photomodule_next')).invoke('observe', 'click', this.onRevealNextImage);
    $A(this.element.getElementsByClassName('but_photomodule_prev')).invoke('observe', 'click', this.onRevealPrevImage);
  },
  
  // protected
  prefetchAnyUnloadedElementAroundCurrentlySelectedElement: function() {
    // still waiting for page_item_count
    if (this.carousel.page_item_count <= 0)
      return;
    
    // still waiting for anything to be selected
    if (this.selected_index == -1)
      return;
      
    // load items around selected one (but not too far)
    var maximum_ahead = 0;
    if (!this.low_memory_agent_mode) {
      // load up to three pages around
      maximum_ahead = this.carousel.page_item_count*3;
    }
    
    if (maximum_ahead == 0)
      return;
      
    for (var distance = 1; distance <= maximum_ahead; distance++) {
      var index, photomodule_element;
      
      // try ahead
      index = this.selected_index + distance;
      photomodule_element = this.photomoduleElementAtIndex(index);
      if (photomodule_element && photomodule_element.needsLoading()) {
        photomodule_element.load();
        return;
      }

      // try behind
      index = this.selected_index - distance;
      photomodule_element = this.photomoduleElementAtIndex(index);
      if (photomodule_element && photomodule_element.needsLoading()) {
        photomodule_element.load();
        return;
      }
    }
  },

  // PRIVATE, use setSeeAlsoLinksVisible and setSeeAlsoLinks methods instead
  showSeeAlsoLinks: function() {
    if (!this.see_also_links_element) return;
    
    if (this.see_also_hide_effect) {
      this.see_also_hide_effect.cancel();
      this.see_also_hide_effect = null;
    }

    if (!this.see_also_show_effect) {
      this.see_also_show_effect = Effect.Appear(
        this.see_also_links_element, {
        duration: 0.1,
        afterFinish: function() {
          this.see_also_show_effect = null;
        }.bind(this) });
    }
  },
  
  // PRIVATE, use setSeeAlsoLinksVisible and setSeeAlsoLinks methods instead
  hideSeeAlsoLinks: function() {
    if (!this.see_also_links_element) return;
    
    if (this.see_also_show_effect) {
      this.see_also_show_effect.cancel();
      this.see_also_show_effect = null;
    }

    var vanish_duration = 0.3;
    if (navigator.userAgent.indexOf('MSIE 6') > -1) vanish_duration = 0;  // IE6 can't alpha png
    
    this.see_also_hide_effect = Effect.Fade(
      this.see_also_links_element, {
      duration: vanish_duration,
      afterFinish: function() {
        this.see_also_hide_effect = null;
      }.bind(this) });
  },

  // PRIVATE, use setVotePanelVisible and setCurrentVote methods instead
  showVotePanel: function() {
    if (!this.vote_panel_element) return;
    
    if (this.vote_panel_hide_effect) {
      this.vote_panel_hide_effect.cancel();
      this.vote_panel_hide_effect = null;
    }

    if (!this.vote_panel_show_effect) {
      this.vote_panel_show_effect = Effect.Appear(
        this.vote_panel_element, {
        duration: 0.1,
        afterFinish: function() {
          this.vote_panel_show_effect = null;
        }.bind(this) });
    }
  },
  
  // PRIVATE, use setVotePanelVisible and setCurrentVote methods instead
  hideVotePanel: function() {
    if (!this.vote_panel_element) return;
    
    if (this.vote_panel_show_effect) {
      this.vote_panel_show_effect.cancel();
      this.vote_panel_show_effect = null;
    }
    
    var vanish_duration = 0.3;
    if (navigator.userAgent.indexOf('MSIE 6') > -1) vanish_duration = 0;  // IE6 can't alpha png
    
    this.vote_panel_hide_effect = Effect.Fade(
      this.vote_panel_element, {
      duration: vanish_duration,
      afterFinish: function() {
        this.vote_panel_hide_effect = null;
      }.bind(this) });
  },
  
  // PRIVATE, use setTopStripVisible method instead
  showTopStrip: function() {
    if (!this.top_strip_element) return;
    
    this.top_strip_element.show();
    
    if (this.top_strip_effect) {
      this.top_strip_effect.cancel();
      this.top_strip_effect = null;
    }
    this.top_strip_effect = new Effect.Opacity(this.top_strip_element, {queue: {position:'front', scope: 'topstrip', limit:1},duration:0, to:1});
  },
  
  // PRIVATE, use setTopStripVisible method instead
  hideTopStrip: function() {
    if (!this.top_strip_element) return;
        
    if (this.top_strip_effect) {
      this.top_strip_effect.cancel();
      this.top_strip_effect = null;
    }
    
    var vanish_duration = 0.2;
    if (Prototype.Browser.IE) vanish_duration = 0;
    
    this.top_strip_effect = new Effect.Opacity(this.top_strip_element, {queue: {position:'end', scope: 'topstrip', limit:1}, duration:vanish_duration, to:0});
  },
  
  // PRIVATE, use setCarouselDisplayed, setCarouselVisible, and displayCarousel methods instead
  showModStrip: function() {
    if (!this.mod_strip_element) return;
    
    this.mod_strip_element.show();
    
    if (this.mod_strip_effect) {
      this.mod_strip_effect.cancel();
      this.mod_strip_effect = null;
    }
    this.mod_strip_effect = new Effect.Opacity(
      this.mod_strip_element, {
      queue: {position:'front', scope: 'modstrip', limit:1},
      duration:0,
      to:1});
  },
  
  // PRIVATE, use setCarouselDisplayed, setCarouselVisible, and displayCarousel methods instead
  hideModStrip: function() {
    if (!this.mod_strip_element) return;
    
    if (this.mod_strip_effect) {
      this.mod_strip_effect.cancel();
      this.mod_strip_effect = null;
    }
    
    var vanish_duration = 0.2;
    if (Prototype.Browser.IE) vanish_duration = 0;
    
    this.mod_strip_effect = new Effect.Opacity(
      this.mod_strip_element, {
      queue: {position:'end', scope: 'modstrip', limit:1},
      duration:vanish_duration,
      to:0,
      afterFinish: (function() { this.mod_strip_element.hide(); }).bind(this)});  // hide at the end for IE8
  },
  
  baseURLForDataSource: function(photomodule, baseurl) {
    var result;
    
    if (this.options.cc_only) {
      result = baseurl + "/cc_only/true";
    } else {
      result = baseurl;
    }
    return result;
  }
});

MMT.Photomodule.EventHandlers = {
  // (method of MMT.Photomodule.EventHandlers)
  revealNextPageInResponseToUserAction: function(event) {
    this.carousel.revealNextPage();
    this.last_user_interaction_date = new Date().getTime();
  },
  
  // (method of MMT.Photomodule.EventHandlers)
  revealPrevPageInResponseToUserAction: function(event) {
    this.carousel.revealPrevPage();
    this.last_user_interaction_date = new Date().getTime();
  },
      
  // (method of MMT.Photomodule.EventHandlers)
  revealNextImageInResponseToUserAction: function(event) {
    this.cancelDelayedSelection();
    this.selectNextElement({
      looping: true,
      user_driven_selection: true});
  },
  
  // (method of MMT.Photomodule.EventHandlers)
  revealPrevImageInResponseToUserAction: function(event) {
    this.cancelDelayedSelection();
    this.selectPreviousElement({
      looping: true,
      user_driven_selection: true});
  },

  // (method of MMT.Photomodule.EventHandlers)
  handleMouseEvent: function(event) {
    // Mouse has moved.
    // Where is it now ?
    
    var mouse = { x: Event.pointerX(event), y: Event.pointerY(event)};
    
    var in_photomodule = false;
    var in_image_and_strips = false;
    var in_carousel = false;
    if (this.element) in_photomodule = Position.within(this.element, mouse.x, mouse.y);
    if (this.image_and_strips_element) in_image_and_strips = Position.within(this.image_and_strips_element, mouse.x, mouse.y);
    if (this.mod_strip_element) in_carousel = Position.within(this.mod_strip_element, mouse.x, mouse.y);
    
    if (in_photomodule || in_image_and_strips || in_carousel) {
      this.element.observe('mousemove', this.onHandleMouseEvent);
      
      // we're inside. But where ?
      
      if (in_image_and_strips) {
        if (in_carousel) {
          this.setMouseZone('carousel');
        } else {
          this.setMouseZone('photo_minus_carousel');
        }
      } else {
        this.setMouseZone('photomodule_minus_photo_minus_carousel');
      }
      
    } else {
      this.setMouseZone('outside');
      this.element.stopObserving('mousemove', this.onHandleMouseEvent);
    }
    
    if (this.mouseZone != 'outside') {
      this.waitForUserInactivityThenVanishOverlay();
    }
  },
  
  // (method of MMT.Photomodule.EventHandlers)
  handleKeyDown: function(event) {
    if (event.shiftKey) return;
    if (event.ctrlKey) return;
    if (event.altKey) return;
    if (event.metaKey) return;
    if (document.activeElement && (document.activeElement.nodeName == 'INPUT' || document.activeElement.nodeName == 'TEXTAREA')) return;
    
    switch(event.keyCode) {
    case Event.KEY_ESC:
      if (this.options.image_sizing == 'hud') {
        // we should escape
        var close_button = $A(document.getElementsByClassName('but_slideshow_close'))[0];
        if (close_button) {
          document.location = close_button.href;
          // Swallow the event
          event.stop();
        }
      }
      break;
    case Event.KEY_LEFT:
      this.waitForUserInactivityThenVanishOverlay();
      this.cancelDelayedSelection();
      this.selectPreviousElement({
        looping: false,                               // Don't loop on key press
        user_driven_selection: true});
      // Swallow the event
      event.stop();
      break;
    case Event.KEY_RIGHT:
      this.waitForUserInactivityThenVanishOverlay();
      this.cancelDelayedSelection();
      this.selectNextElement({
        looping: false,                               // Don't loop on key press
        user_driven_selection: true});
      // Swallow the event
      event.stop();
      break;
    }
  },

  // (method of MMT.Photomodule.EventHandlers)
  // PRIVATE
  setMouseZone: function(mouseZone) {
    if (mouseZone != this.mouseZone) {
      this.mouseZone = mouseZone;
      switch(mouseZone) {
        case 'carousel':
          this.setSeeAlsoLinksVisible(false);
          this.setVotePanelVisible(false);
          this.setTopStripVisible(true);
          this.setCarouselVisible(true);
          this.setSuspended(true);
          break;
        case 'photo_minus_carousel':
          this.setSeeAlsoLinksVisible(true);
          this.setVotePanelVisible(true);
          this.setTopStripVisible(true);
          this.setCarouselVisible(true);
          this.setSuspended(true);
          break;
        case 'photomodule_minus_photo_minus_carousel':
          this.setSeeAlsoLinksVisible(false);
          this.setVotePanelVisible(false);
          this.setTopStripVisible(false);
          this.setCarouselVisible(false);
          this.setSuspended(true);
          break;
        case 'outside':
          this.setSeeAlsoLinksVisible(false);
          this.setVotePanelVisible(false);
          this.setTopStripVisible(false);
          this.setCarouselVisible(false);
          this.setSuspended(false);
          break;
      }
    }
  },

  // (method of MMT.Photomodule.EventHandlers)
  // PRIVATE
  waitForUserInactivityThenVanishOverlay: function() {
    
    this.cancelWaitForUserInactivityThenVanishOverlay()
    
    var user_inactivity_function = function() {
      this.user_inactivity_timeout = null;
      this.setMouseZone('outside');
    }.bind(this);
    
    this.user_inactivity_timeout = setTimeout(user_inactivity_function, 5000);
  },
  
  // (method of MMT.Photomodule.EventHandlers)
  // PRIVATE
  cancelWaitForUserInactivityThenVanishOverlay: function(){
    if (this.user_inactivity_timeout) {
      clearTimeout(this.user_inactivity_timeout)
      this.user_inactivity_timeout = null
    }    
  }  
}

MMT.Photomodule.PhotomoduleElementMethods = {

  // (method of MMT.Photomodule.PhotomoduleElementMethods)
  // PUBLIC
  // Returns an instance of PhotomoduleElement.
  // Shortcut for photomoduleElementAtIndex(selectedIndex())
  selectedPhotomoduleElement: function() {
    return this.photomoduleElementAtIndex(this.selected_index);
  },

  // (method of MMT.Photomodule.PhotomoduleElementMethods)
  // PUBLIC
  // Returns an instance of PhotomoduleElement.
  photomoduleElementAtIndex: function(index) {
    return this.data_source_item_collection.dataSourceItemAtIndex(index);
  },

  // (method of MMT.Photomodule.PhotomoduleElementMethods)
  // PUBLIC
  photomoduleElementCount: function() {
    return this.data_source_item_collection.dataSourceItemCount();
  }
  
}


MMT.Photomodule.SelectionMethods = {

  // (method of MMT.Photomodule.SelectionMethods)
  // PUBLIC
  // See also selectedPhotomoduleElement()
  selectedIndex: function() {
    return this.selected_index;
  },
  
  // (method of MMT.Photomodule.SelectionMethods)
  // PUBLIC
  // Returns true if the required selection is performed
  // Valid options are:
  // - user_driven_selection: boolean, default true. Use true if and only if the selection is triggered by a user action.
  // - transition: name of the transition to apply
  setSelectedIndex: function(index, options) {
    if (index == this.selected_index) return false;
    if (index < 0) return false;
    if (index > this.data_source_item_collection.dataSourceItemCount() - 1) return false;

    this.cancelDelayedSelection();
    
    var select_options = {
      user_driven_selection:  true,                               // if true, the user did himself select the element. If false, the element is selected by the slide_show or any other automatic way.
      transition:             this.options.slideshow_transition   // default transition
    }
    Object.extend(select_options, options || {});
    
    // get actual elements
    var selected_photomodule_element = this.photomoduleElementAtIndex(this.selected_index);
    var photomodule_element = this.photomoduleElementAtIndex(index);
    
    
    // what is the exact used transition ?
    
    // are we forwarding ? looping ?
    var forward_direction = true;
    if (index < this.selected_index) forward_direction = false;
    if (select_options.actual_looping) forward_direction = !forward_direction;
    
    // is there an entrance transition ?
    var entrance_transition;
    if (forward_direction) {
      entrance_transition = photomodule_element.getEntranceTransition();
    } else {
      entrance_transition = photomodule_element.getExitTransition();
    }
    
    if (entrance_transition) {
      select_options.transition = entrance_transition;
    } else {
      // an exit transition, maybe ?
      if (selected_photomodule_element) {
        var exit_transition;
        if (forward_direction) {
          exit_transition = selected_photomodule_element.getExitTransition();
        } else {
          exit_transition = selected_photomodule_element.getEntranceTransition();
        }
        if (exit_transition) {
          select_options.transition = exit_transition;
        }
      }
    }
    
    // should we slide left or right ?
    if (select_options.transition == 'slide') {
      if (forward_direction) {
        select_options.transition = 'slide_left';
      } else {
        select_options.transition = 'slide_right';
      }
    }
    
    // should we really slide ?
    if (!selected_photomodule_element) {
      switch(select_options.transition) {
      case 'slide_left':
      case 'slide_right':
        // don't slide in first element
        select_options.transition = 'none';
        break;
      }
    }
    
    
    // OK, setup is done now

    // WILL ...
    this.willSetSelectedIndex(index, select_options);
    
    // ... DO ...
    this.selected_index = index;
    
    // don't display element unless it's loaded
    if (photomodule_element.loaded()) {
      this.displaySelectedItem();
    } else {
      photomodule_element.load();
    }

    return true;
  },
  
  // (method of MMT.Photomodule.SelectionMethods)
  // PUBLIC
  // Returns true if the required selection is performed
  // Valid options are:
  // - user_driven_selection: boolean, default true. Use true if and only if the selection is triggered by a user action.
  // - transition: name of the transition to apply
  // - looping: boolean, defaulting to the slideshow_loop option provided to the Photomodule constructor. If false, this method will fail (return false) if the first element is selected.
  selectPreviousElement: function(options) {
    var select_options = {
      looping: this.options.slideshow_loop
    }
    Object.extend(select_options, options || {});
    
    if (this.selected_index == -1) {
      // no previous element
      return false;
    } else {
      // When the user types the right arrow, and a transition has just begun, the use misses a photo.
      // commented code below is a fix attempt.
      // Unfortunately, this prevent rapid scrolling thru photos via keyboard.
      // We need a better conceptualisation of the bug.
      // FIXME:
      //
      // if (this.current_transition && this.current_transition.isTransitionToPrevious()) {
      //   return false;
      // }
      
      var index = this.selected_index - 1;
      if (index < 0) index = this.data_source_item_collection.dataSourceItemCount() - 1;
      
      if (index == this.selected_index)
        return false;
        
      if (index == (this.data_source_item_collection.dataSourceItemCount() - 1)) {
        if (select_options.looping) {
          select_options.actual_looping = true;
        } else {
          return false;
        }
      }
      
      return this.setSelectedIndex(index, select_options);
    }
    return false;
  },
  
  // (method of MMT.Photomodule.SelectionMethods)
  // PUBLIC
  // Returns true if the required selection is performed
  // Valid options are:
  // - user_driven_selection: boolean, default true. Use true if and only if the selection is triggered by a user action.
  // - transition: name of the transition to apply
  // - looping: boolean, defaulting to the slideshow_loop option provided to the Photomodule constructor. If false, this method will fail (return false) if the last element is selected.
  selectNextElement: function(options) {
    var select_options = {
      looping: this.options.slideshow_loop
    }
    Object.extend(select_options, options || {});
    
    if (this.selected_index == -1) {
      // no next element
      return false;
    } else {
      // When the user types the right arrow, and a transition has just begun, the use misses a photo.
      // commented code below is a fix attempt.
      // Unfortunately, this prevent rapid scrolling thru photos via keyboard.
      // We need a better conceptualisation of the bug.
      // FIXME:
      //
      // if (this.current_transition && this.current_transition.isTransitionToNext()) {
      //   return false;
      // }
      
      var index = this.selected_index + 1;
      if (index > this.data_source_item_collection.dataSourceItemCount() - 1) index = 0;
      
      if (index == this.selected_index)
        return false;
        
      if (index == 0) {
        if (select_options.looping) {
          select_options.actual_looping = true;
        } else {
          return false;
        }
      }
      
      return this.setSelectedIndex(index, select_options);
    }
    
    return false;
  },

  // (method of MMT.Photomodule.SelectionMethods)
  // PROTECTED
  cancelDelayedSelection: function() {
    if (this.delayed_select_next_element_timeout) {
      clearTimeout(this.delayed_select_next_element_timeout);
      this.delayed_select_next_element_timeout = null;
    }
  },
  
  // (method of MMT.Photomodule.SelectionMethods)
  // PROTECTED
  delayedSelectNextElement: function(options) {
    var select_options = {
      user_driven_selection: false
    }
    Object.extend(select_options, options || {});
    
    if (this.current_transition) {
      // we'll call delayedSelectNextElement after the transition is over
      return;
    }
    
    this.cancelDelayedSelection();
    
    var delay = this.options.slideshow_delay;
    var photomodule_element = this.photomoduleElementAtIndex(this.selected_index);
    if (photomodule_element) {
      var element_delay = photomodule_element.getAppearanceDuration();
      if (element_delay && element_delay > 0) delay = element_delay;
    }
    
    var timeout_function = function() {
      this.delayed_select_next_element_timeout = null;
      if (this.playing) {
        if (this.suspended) {
          // suspend selection
          this.suspended_selection_options = select_options;
        } else {
          // do select
          var select_succeeded = this.selectNextElement(select_options);
          if (!select_succeeded) { this.stop(); }
        }
      }
    }.bind(this);
    
    // remove transition duration
    // FIXME: we should not compute like that the delay
    delay = Math.max(0.5, delay - MMT.PhotomoduleTransition.default_duration(this.options.slideshow_transition));
    

    this.delayed_select_next_element_timeout = setTimeout(timeout_function, delay * 1000);
  },

  // (method of MMT.Photomodule.SelectionMethods)
  // PROTECTED
  willSetSelectedIndex: function(index, options) {
    if (this.current_transition) {
      this.current_transition.cancel();
      this.aborted_transition = this.current_transition;
      this.current_transition = null;
    }
    
    this.old_current_selection_options = this.current_selection_options;
    this.current_selection_options = options;
    
    this.cancelDelayedSelection();
    
    var now = new Date().getTime();
    if (this.last_element_selection_date >= 0) {
      this.delay_since_last_element_selection_date = now - this.last_element_selection_date;
    }
    this.last_element_selection_date = now;
    
    if (this.current_selection_options.user_driven_selection) this.last_user_interaction_date = now;

    if (this.carouselShouldRevealSelectedItem()) {
      this.revealItemAtIndex(index);
    }
    
    var photomodule_element = this.photomoduleElementAtIndex(this.selected_index);
    if (photomodule_element) photomodule_element.willBeUnselected();
    
    photomodule_element = this.photomoduleElementAtIndex(index);
    photomodule_element.willBeSelected();
  },
  
  // (method of MMT.Photomodule.SelectionMethods)
  // PROTECTED
  carouselShouldRevealSelectedItem: function() {
    if (this.current_selection_options.user_driven_selection) return true;
    if (this.last_user_interaction_date < 0) return true;
    
    var delay_since_last_user_interaction_date = new Date().getTime() - this.last_user_interaction_date;
    return (delay_since_last_user_interaction_date >= MMT.Photomodules.minimum_delay_since_last_user_interaction_meaning_user_is_passive);
  },
  
  // (method of MMT.Photomodule.SelectionMethods)
  // PROTECTED
  didSelectElementAtIndex: function(index) {
    if (this.aborted_transition) this.aborted_transition.dispose();
    delete this.aborted_transition;

    if (this.current_transition) this.current_transition.dispose();
    delete this.current_transition;

    var photomodule_element = this.photomoduleElementAtIndex(index);
    photomodule_element.wasSelected();
    this.last_selected_index = index;
    
    if (this.playing && photomodule_element.loaded()) this.delayedSelectNextElement();
  },
  
  // (method of MMT.Photomodule.SelectionMethods)
  // PROTECTED
  didNotSelectElementAtIndex: function(index) {
    this.setSelectedIndex(this.last_selected_index, this.current_selection_options);
  },

  // (method of MMT.Photomodule.SelectionMethods)
  // PROTECTED
  displaySelectedItem: function() {
    // Dec 24 2009 (ber)
    // There was a regression in prod during several days. The first image was appearing, then disappearing after a while. 
    // My understanding is that the first image is somehow loaded before the datasource is woken up. 
    // When woken up, it tells its delegate its items are updated. In our case, this was ending up calling current method. 
    // In turn, this method triggers a transition, between index 0 and index 0 !
    // At the end of the transition, PhotomoduleElementItem::wasUndisplayed is called, and it removes current 
    // the "undisplayed" element from DOM.  
    // in the case of equal indices (0 and 0 in this specific case), the "undisplayed" element is actually the same as 
    // the "displayed" one and we end up removing the element which we just displayed, and which was there already anyway :)
    //
    // I really don't like my fix, but I do not understand the code enough to fix the source issue. 
    // 
    // please also see https://github.com/fotonauts/picor/commit/44660242e9dcc22d5f382e2126570932cffd08fe 
    // for a related fix which is triggered by the same source issue I think. 
    // 
    if (this.last_displayed_index == this.selected_index) return; 
    
    // a photomodule element will appear: update UI to comply with the selection
    
    // photomodule_element itself will update caption (author, license, etc.)
    var photomodule_element = this.photomoduleElementAtIndex(this.selected_index);
    photomodule_element.willDisplay();
    
    // update HUD button link
    if (this.options.hud_base_url) {
      $A(this.element.getElementsByClassName('but_hud_open')).each(function(element) {
        // reveal button
        Element.show(element);
        
        // update its link and enable it
        element.href = this.options.hud_base_url + '/photos/'+this.selected_index;
        if (this.options.cc_only) {
          element.href = element.href + "/cc_only/true";
        }
        element.removeClassName('disabled');
      }.bind(this));
    }
    
    // launch transition
    var transition = this.current_selection_options.transition;

    // don't use transition if aborted selection is not *enough* finished yet, or if user is too fast anyway.
    if (this.delay_since_last_element_selection_date >= 0 &&
        ( (this.aborted_transition && this.delay_since_last_element_selection_date < this.aborted_transition.cancel_delay()*1000) ||
          this.delay_since_last_element_selection_date < 200)) {
      transition = 'none';
    }
    
    this.current_transition = MMT.PhotomoduleTransition.make(transition, this, this.last_displayed_index, this.selected_index);
    
    // accelerate transition if transition is user driven
    if (this.current_selection_options.user_driven_selection &&
        this.current_transition.duration > 0.5) this.current_transition.duration = 0.5;
    
    this.last_displayed_index = this.selected_index;
    this.current_transition.start();

    // external callback
    this.options.on_display_current_element(this.selected_index);
  },

  // (method of MMT.Photomodule.SelectionMethods)
  // PROTECTED
  revealItemAtIndex: function(index) {
    this.carousel.revealItemAtIndex(index);
  }
}

MMT.Photomodule.SlideshowMethods = {
  // (method of MMT.Photomodule.SlideshowMethods)
  // if immediate_transition is true, the selection of next element starts right away
  // if false, the selection of next element is delayed
  // PUBLIC
  play: function(immediate_transition) {
    this.suspended_selection_options = null;
    this.suspended = false;
    this.playing = true;
    if (immediate_transition) {
      this.selectNextElement({ user_driven_selection: false });
    } else {
      this.delayedSelectNextElement();
    }
    
    this.buts_slideshow_play.invoke('disable');
    this.buts_slideshow_stop.invoke('enable');
    
    createCookie('slideshow_auto_play', 'true', 0);
  },
  
  // (method of MMT.Photomodule.SlideshowMethods)
  // PUBLIC
  stop: function() {
    this.suspended_selection_options = null;
    this.suspended = false;
    this.playing = false;
    this.cancelDelayedSelection();
    
    this.buts_slideshow_play.invoke('enable');
    this.buts_slideshow_stop.invoke('disable');
    
    createCookie('slideshow_auto_play', 'false', 0);
  },
  
  // (method of MMT.Photomodule.SlideshowMethods)
  // if value, slideshow is interrupted
  // if !value, slideshow is relaunched (if it should do so)
  // PROTECTED
  setSuspended: function(value) {
    if (this.suspended != value) {
      this.suspended = value;
      if (this.suspended) {
        if (this.current_transition) {
          this.current_transition.rush_to_finish();
        }
      } else {
        if (this.suspended_selection_options) {
          var selection_options = this.suspended_selection_options;
          this.suspended_selection_options = null;
          var select_succeeded = this.selectNextElement(selection_options);
          if (!select_succeeded) { this.stop(); }
        }
      }
    }
  }
}

MMT.Photomodule.PropertiesMethods = {
  // (method of MMT.Photomodule.PropertiesMethods)
  // PUBLIC
  setSlideshowTransition: function(value) {
    this.options.slideshow_transition = value;
  },
  
  // (method of MMT.Photomodule.PropertiesMethods)
  // PUBLIC
  setSlideshowDelay: function(value) {
    this.options.slideshow_delay = value;
    if (this.playing) {
      this.stop();
      this.play();
    }
  },
  
  // (method of MMT.Photomodule.PropertiesMethods)
  // PUBLIC
  setPhotomoduleImageSizing: function(value) {
    this.options.image_sizing = value;
    // TODO: show the difference
  },
  
  // (method of MMT.Photomodule.PropertiesMethods)
  // PUBLIC
  showPhotomoduleImageSizing: function() {
    var photomodule_element = this.photomoduleElementAtIndex(this.selected_index);
    if (photomodule_element.resizePane) photomodule_element.resizePane();
  },
  
  // (method of MMT.Photomodule.PropertiesMethods)
  // sets whether the carousel should display or not (in general)
  // PUBLIC
  setCarouselDisplayed: function(value) {
    if (this.options.carousel_displayed != value) {
      this.options.carousel_displayed = value;
      if (value) {
        this.showModStrip();
      } else {
        this.hideModStrip();
      }
    }
  },
  
  // (method of MMT.Photomodule.PropertiesMethods)
  // PROTECTED
  setCarouselVisible: function(value) {
    if (this.options && this.options.carousel_displayed) {
      if (this.mod_strip_visible != value) {
        this.mod_strip_visible = value;
        if (this.mod_strip_visible) {
          this.showModStrip();
        } else {
          this.hideModStrip();
        }
      }
    } else {
      this.hideModStrip();
    }
  },
  
  // (method of MMT.Photomodule.PropertiesMethods)
  // PROTECTED
  setSeeAlsoLinksVisible: function(value) {
    if (this.see_also_links_visible != value) {
      this.see_also_links_visible = value;
      if (this.see_also_links_visible) {
        if (this.see_also_links) {
          this.showSeeAlsoLinks();
        } else {
          this.hideSeeAlsoLinks();
        }
      } else {
        this.hideSeeAlsoLinks();
      }
    }
  },
  
  // (method of MMT.Photomodule.PropertiesMethods)
  // PROTECTED
  setVotePanelVisible: function(value) {
    if (this.vote_panel_visible != value) {
      this.vote_panel_visible = value;
      if (this.vote_panel_visible) {
        if (typeof(this.current_vote) != typeof(null)) {
          this.showVotePanel();
        } else {
          this.hideVotePanel();
        }
      } else {
        this.hideVotePanel();
      }
    }
  },
  
  // (method of MMT.Photomodule.PropertiesMethods)
  // PROTECTED
  setTopStripVisible: function(value) {
    if (this.top_strip_visible != value) {
      this.top_strip_visible = value;
      if (this.top_strip_visible) {
        this.showTopStrip();
      } else {
        this.hideTopStrip();
      }
    }
  },

  // (method of MMT.Photomodule.PropertiesMethods)
  // PUBLIC
  // latest spec: case 1565
  setSeeAlsoLinks: function(links) {
    if (!$('see_also_links')) return;
    if (links && links.length > 0) {
      this.see_also_links = links;
      $('see_also_links').update(this.see_also_links.join(", "));
      if (this.see_also_links_visible) this.showSeeAlsoLinks();
    } else {
      this.see_also_links = null;
      this.hideSeeAlsoLinks();
    }
  },
  
  // (method of MMT.Photomodule.PropertiesMethods)
  // PUBLIC
  setCurrentVote: function(vote) {
    this.current_vote = vote;
    if (typeof(this.current_vote) != typeof(null)) {
      if (this.vote_panel_visible) this.showVotePanel();
    } else {
      this.hideVotePanel();
    }
  }
}

MMT.Photomodule.WidgetEditorTargettedMethods = {
  // (method of MMT.Photomodule.WidgetEditorTargettedMethods)
  // call this method after a user-driven transition change: the transition will run in all its glory
  // PUBLIC
  showTransition: function() {
    this.last_element_selection_date = -1;
    this.delay_since_last_element_selection_date = -1;
    if (this.data_source_item_collection.dataSourceItemCount() == 1) {
      this.setSelectedIndex(
        0, {
        user_driven_selection: false});
    } else {
      this.selectNextElement({
        looping: true,
        user_driven_selection: false});
    }
  },
  
  // (method of MMT.Photomodule.WidgetEditorTargettedMethods)
  // call this method after a user-driven call to setCarouselDisplayed(true): the carousel will
  // display in all its glory, regardless of the mouse position
  // PUBLIC
  displayCarousel: function() {
    this.showModStrip();
  }
}

MMT.Photomodule.CarouselDelegateMethods = {
  // (method of MMT.Photomodule.CarouselDelegateMethods)
  // returns the number of items
  numberOfCarouselItems: function(carousel)
  {
    var ret = this.data_source_item_collection.dataSourceItemCount();
    MMT.log('numberOfCarouselItems = ' + ret);
    // force asset deployment
    return ret;
  },
  
  // (method of MMT.Photomodule.CarouselDelegateMethods)
  // returns a HTML dom element
  elementForCarousel_atIndex: function(carousel, index)
  {
    var photomodule_element = this.photomoduleElementAtIndex(index);
    if (photomodule_element)
      return photomodule_element.carouselDomElement();
    //alert('No element at index '+index)
    return null;
  },

  // (method of MMT.Photomodule.CarouselDelegateMethods)
  carouselDidChangeRevealedItems: function(carousel)
  {
    if (this.carousel.firstItemIsRevealed()) {
      $A(this.element.getElementsByClassName('but_carousel_prev_page')).each(function(element) {
        element.addClassName('but_carousel_prev_page_disabled')
      });
    } else {
      $A(this.element.getElementsByClassName('but_carousel_prev_page')).each(function(element) {
        element.removeClassName('but_carousel_prev_page_disabled')
      });
    }

    if (this.carousel.lastItemIsRevealed()) {
      $A(this.element.getElementsByClassName('but_carousel_next_page')).each(function(element) {
        element.addClassName('but_carousel_next_page_disabled')
      });
    } else {
      $A(this.element.getElementsByClassName('but_carousel_next_page')).each(function(element) {
        element.removeClassName('but_carousel_next_page_disabled')
      });
    }
  },
  
  // (method of MMT.Photomodule.CarouselDelegateMethods)
  carousel_willSetLeftMostRevealedItemIndex: function(carousel, index) {
    // photomodule's carousel does nothing here (see hud.js for a different behavior)
    return index;
  }
}

MMT.Photomodule.DataSourceItemCollectionDelegateMethods = {
  // (method of MMT.Photomodule.DataSourceItemCollectionDelegateMethods)
  dataSourceItemCollection_didUpdateDataSourceItem_atIndex: function(data_source, photomodule_element, index)
  {
    this.carousel.replaceElement_atIndex(photomodule_element.carouselDomElement(), index);
    photomodule_element.setDelegate(this);
    photomodule_element.setPhotomodule(this);
    if (photomodule_element.setVoteController) photomodule_element.setVoteController(this.vote_controller);
    if (index == this.selected_index) {
      photomodule_element.willBeSelected();

      if (photomodule_element.loaded()) {
        this.displaySelectedItem();
      } else {
        photomodule_element.load();
      }
    }
    
	if (this.options.selected_item_id && this.options.selected_item_id == photomodule_element.get_item_id()) {
		this.setSelectedIndex(index);
	}

    // select item if none is selected, and it is loadable or loaded, and it is revealed in carousel
    if (this.selected_index == -1 && (photomodule_element.needsLoading() || photomodule_element.loaded()) && this.carousel.itemAtIndexIsRevealed(index)) {
      // no selection + carousel well windowed => select this loaded element
      this.setSelectedIndex(index);
      return;
    }
  },
  
  // (method of MMT.Photomodule.DataSourceItemCollectionDelegateMethods)
  dataSourceItemCollection_bestRangeForRange:function(datasource, range){
    // still waiting for page_item_count
    if (this.carousel.page_item_count <= 0)
      return null;
      
    // load the whole page containing index, plus two pages behind
    var newLocation =  Math.max(0, this.carousel.page_item_count * Math.floor(range.location() / this.carousel.page_item_count) - 2*this.carousel.page_item_count);
    var newLength = 5 * this.carousel.page_item_count;
    return new MMT.Range(newLocation, newLength);
  }
}

MMT.Photomodule.PhotomoduleElementDelegateMethods = {
  // (method of MMT.Photomodule.PhotomoduleElementDelegateMethods)
  photomoduleElementPaneDidLoad: function(photomodule_element)
  {
    var index = this.data_source_item_collection.indexForDataSourceItem(photomodule_element);
    if (index == this.selected_index) {
      this.displaySelectedItem();
    }
    setTimeout(this.prefetchAnyUnloadedElementAroundCurrentlySelectedElement.bind(this), 50);
  },
  
  // (method of MMT.Photomodule.PhotomoduleElementDelegateMethods)
  photomoduleElementPaneDidNotLoad: function(photomodule_element)
  {
    var index = this.data_source_item_collection.indexForDataSourceItem(photomodule_element);
    if (index == this.selected_index) {
      this.didNotSelectElementAtIndex(index);
    }
  },
  
  // (method of MMT.Photomodule.PhotomoduleElementDelegateMethods)
  photomoduleElementThumbnailWasClicked: function(photomodule_element)
  {
    var index = this.data_source_item_collection.indexForDataSourceItem(photomodule_element);
    if (index != -1) {
      this.setSelectedIndex(index, { user_driven_selection: true });
      // this.stop(); // no more stopping of photomodule when clicking an element
    }
  }
}

Object.extend(MMT.Photomodule.prototype, MMT.Photomodule.EventHandlers);
Object.extend(MMT.Photomodule.prototype, MMT.Photomodule.PhotomoduleElementMethods);
Object.extend(MMT.Photomodule.prototype, MMT.Photomodule.SelectionMethods);
Object.extend(MMT.Photomodule.prototype, MMT.Photomodule.SlideshowMethods);
Object.extend(MMT.Photomodule.prototype, MMT.Photomodule.PropertiesMethods);
Object.extend(MMT.Photomodule.prototype, MMT.Photomodule.WidgetEditorTargettedMethods);
Object.extend(MMT.Photomodule.prototype, MMT.Photomodule.CarouselDelegateMethods);
Object.extend(MMT.Photomodule.prototype, MMT.Photomodule.DataSourceItemCollectionDelegateMethods);
Object.extend(MMT.Photomodule.prototype, MMT.Photomodule.PhotomoduleElementDelegateMethods);

MMT.Photomodule.ButtonSlideShowPlay = Class.create({
  initialize: function(photomodule, element) {
    this.photomodule = photomodule;
    this.element = $(element);
    this.setupBehaviors();
  },
  
  setupBehaviors: function() {
    this.onClick = this.click.bindAsEventListener(this);
    this.element.observe('click', this.onClick);
    
    if (this.photomodule.playing) {
      this.disable();
    } else {
      this.enable();
    }
  },
  
  enable: function() {
    this.element.stopObserving('click', this.onClick);
    this.element.observe('click', this.onClick);
    this.element.removeClassName('but_slideshow_play_disabled');
  },
  
  disable: function() {
    this.element.stopObserving('click', this.onClick);
    this.element.addClassName('but_slideshow_play_disabled');
  },
  
  dispose: function() {
    this.photomodule = null;
    this.element.stopObserving('click', this.onClick);
  },
  
  click: function() {
    this.photomodule.play(true);
  }
});


MMT.Photomodule.ButtonSlideShowStop = Class.create({
  initialize: function(photomodule, element) {
    this.photomodule = photomodule;
    this.element = $(element);
    this.setupBehaviors();
  },
  
  setupBehaviors: function() {
    this.onClick = this.click.bindAsEventListener(this);
    this.element.observe('click', this.onClick);
    
    if (this.photomodule.playing) {
      this.enable();
    } else {
      this.disable();
    }
  },
  
  enable: function() {
    this.element.stopObserving('click', this.onClick);
    this.element.observe('click', this.onClick);
    this.element.removeClassName('but_slideshow_stop_disabled');
  },
  
  disable: function() {
    this.element.stopObserving('click', this.onClick);
    this.element.addClassName('but_slideshow_stop_disabled');
  },
  
  dispose: function() {
    this.element.stopObserving('click', this.onClick);
    this.photomodule = null;
  },
  
  click: function() {
    this.photomodule.stop();
  }
});

// Subclass of MMT.DataSourceItemCollection that is able to create MMT.PhotomoduleElementItem
MMT.Photomodule.DataSourceItemCollection = Class.create(MMT.DataSourceItemCollection, {
  buildDataSourceItemsFromObjects: function(data_source_item_representations) {
    return data_source_item_representations.map(function(element_descriptor) {
      switch(element_descriptor.element_class) {
      case 'MMT.PhotomoduleElementItem':
        return new MMT.PhotomoduleElementItem(element_descriptor.options);
      }
      return null;
    });
  },

  newPlaceholderDataSourceItem: function() {
    return new MMT.PhotomoduleElementItem({
      carousel_item_html: '<span class="photomodule_thumbnail"><span class="content"><span class="content2"><img alt="" class="square" src="'+MMT.Assets.base_url+'/assets/web/loading_thumb.gif" title=""><span class="border"></span></span></span></span>'
    });
  }
});


if (Object.isUndefined(MMT.Photomodule)) throw("widget.js requires including photomodule.js library");

MMT.MINI_WIDGET_WIDTH  = 250


MMT.Widget = Class.create({
  // ----------------------
  
  initialize: function (options) {
    this.options = {
      editable: false
    }
    Object.extend(this.options, options || {});

    // public members
    this.photomodule = null;
    
    //
    this.setupBehaviors();
  },
  
  // protected
  setupBehaviors: function() {
    // [#931]
    this.makeLinksOpenInTopWindow();
    this.setupPhotomodule();
    
    if (this.options.editable) {
      // load fresh configuration from enclosing window (the user may have changed some parameters since I've been requested)
      // new MMT.WidgetEditor('widget_editor'
      window.parent.document.MMT.WidgetEditors.find('widget_editor').widgetLoaded(this, document);
    }
  },
  
  // protected
  setupPhotomodule: function() {
    if (this.photomodule) return;
    this.photomodule = MMT.Photomodules.find('photomodule');
    if (this.photomodule) {
      photomodule.enable();
      // [#931]
      photomodule.options.on_display_current_element = this.makeLinksOpenInTopWindow.bind(this);
      photomodule.options.open_item_in_context = true;
    }
  },
  
  // protected
  makeLinksOpenInNewWindow: function() {
    $A(document.getElementsByTagName('a')).each(function(element) {
      if (!element.onclick) {
        element.setAttribute('target','_blank'); // so that status bar reveal that a new window will open
      }
    })
  },
  
  // protected
  makeLinksOpenInTopWindow: function() {
    $A(document.getElementsByTagName('a')).each(function(element) {
      if (!element.onclick) {
        if (!element.target || element.target == '') {
          element.setAttribute('target','_top'); // so that status bar reveal that a new window will open
        }
      }
    })
  },
  
  setAutoPlay: function(value) {
    if (value) {
      this.photomodule.play();
    } else {
      this.photomodule.stop();
      this.photomodule.setSelectedIndex(0);
    }
  },
  
  setCarouselDisplayed: function(value) {
    this.photomodule.setCarouselDisplayed(value);
    if (value) this.photomodule.displayCarousel();
  }
});

// ----------------------
// Painful view constants
// ----------------------

// MMT.Widget.WIDGET_HEADER_HEIGHT   = 28;
// MMT.Widget.WIDGET_FOOTER_HEIGHT   = 28;


MMT.Widget.photomoduleLeftMargin = function(widget_skin) {
  // Keep in sync with ruby method ViewContext::Widget#widget_photomodule_left_margin
  switch(widget_skin) {
  case 'legacy':
    return 7;
  case 'dark_unframed':
  case 'bright_unframed':
    return 0;
  case 'dark_framed':
  case 'bright_framed':
    return 14;
  }
}

MMT.Widget.photomoduleRightMargin = function(widget_skin) {
  // Keep in sync with ruby method ViewContext::Widget#widget_photomodule_right_margin
  switch(widget_skin) {
  case 'legacy':
    return 7;
  case 'dark_unframed':
  case 'bright_unframed':
    return 0;
  case 'dark_framed':
  case 'bright_framed':
    return 14;
  }
}

MMT.Widget.photomoduleTopMargin = function(widget_skin, widget_width) {
  // Keep in sync with ruby method ViewContext::Widget#widget_photomodule_top_margin
  switch(widget_skin) {
  case 'legacy':
    if (widget_width <= MMT.MINI_WIDGET_WIDTH) return 22;
    return 28;
  case 'dark_unframed':
  case 'bright_unframed':
    return 0;
  case 'dark_framed':
  case 'bright_framed':
    return 14;
  }
}

MMT.Widget.photomoduleBottomMargin = function(widget_skin, widget_width) {
  // Keep in sync with ruby method ViewContext::Widget#widget_photomodule_bottom_margin
  switch(widget_skin) {
  case 'legacy':
    if (widget_width <= MMT.MINI_WIDGET_WIDTH) return 22;
    return 28;
  case 'dark_unframed':
  case 'bright_unframed':
  case 'dark_framed':
  case 'bright_framed':
    return 25;
  }
}

MMT.Widget.photomoduleFooterHeight = function(widget_skin) {
  // Keep in sync with ruby method ViewContext::Widget#widget_photomodule_footer_height
  switch(widget_skin) {
  case 'legacy':
    return 0;
  case 'dark_unframed':
  case 'bright_unframed':
  case 'dark_framed':
  case 'bright_framed':
    return 17;
  }
}