/*  Prototype JavaScript framework, version 1.4.0
 *  (c) 2005 Sam Stephenson <sam@conio.net>
 *
 *  THIS FILE IS AUTOMATICALLY GENERATED. When sending patches, please diff
 *  against the source tree, available from the Prototype darcs repository.
 *
 *  Prototype is freely distributable under the terms of an MIT-style license.
 *
 *  For details, see the Prototype web site: http://prototype.conio.net/
 *
/*--------------------------------------------------------------------------*/

var Prototype = {
  Version: '1.4.0',
  ScriptFragment: '(?:<script.*?>)((\n|\r|.)*?)(?:<\/script>)',

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

var Class = {
  create: function() {
 return function() {
   this.initialize.apply(this, arguments);
 }
  }
}

var Abstract = new Object();

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

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

Function.prototype.bind = function() {
  var __method = this, args = $A(arguments), object = args.shift();
  return function() {
 return __method.apply(object, args.concat($A(arguments)));
  }
}

Function.prototype.bindAsEventListener = function(object) {
  var __method = this;
  return function(event) {
 return __method.call(object, event || window.event);
  }
}

Object.extend(Number.prototype, {
  toColorPart: function() {
 var digits = this.toString(16);
 if (this < 16) return '0' + digits;
 return digits;
  },

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

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

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

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

 return returnValue;
  }
}

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

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

 this.registerCallback();
  },

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

  onTimerEvent: function() {
 if (!this.currentlyExecuting) {
   try {
     this.currentlyExecuting = true;
     this.callback();
   } finally {
     this.currentlyExecuting = false;
   }
 }
  }
}

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

function $() {
  var elements = new Array();

  for (var i = 0; i < arguments.length; i++) {
 var element = arguments[i];
 if (typeof element == 'string')
   element = document.getElementById(element);

 if (arguments.length == 1)
   return element;

 elements.push(element);
  }

  return elements;
}
Object.extend(String.prototype, {
  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(eval);
  },

  escapeHTML: function() {
 var div = document.createElement('div');
 var text = document.createTextNode(this);
 div.appendChild(text);
 return div.innerHTML;
  },

  unescapeHTML: function() {
 var div = document.createElement('div');
 div.innerHTML = this.stripTags();
 return div.childNodes[0] ? div.childNodes[0].nodeValue : '';
  },

  toQueryParams: function() {
 var pairs = this.match(/^\??(.*)$/)[1].split('&');
 return pairs.inject({}, function(params, pairString) {
   var pair = pairString.split('=');
   params[pair[0]] = pair[1];
   return params;
 });
  },

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

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

 var camelizedString = this.indexOf('-') == 0
   ? oStringList[0].charAt(0).toUpperCase() + oStringList[0].substring(1)
   : oStringList[0];

 for (var i = 1, len = oStringList.length; i < len; i++) {
   var s = oStringList[i];
   camelizedString += s.charAt(0).toUpperCase() + s.substring(1);
 }

 return camelizedString;
  },

  inspect: function() {
 return "'" + this.replace('\\', '\\\\').replace("'", '\\\'') + "'";
  }
});

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

var $break    = new Object();
var $continue = new Object();

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

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

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

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

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

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

  grep: function(pattern, iterator) {
 var results = [];
 this.each(function(value, index) {
   var stringValue = value.toString();
   if (stringValue.match(pattern))
     results.push((iterator || Prototype.K)(value, index));
 })
 return results;
  },

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

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

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

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

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

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

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

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

  sortBy: function(iterator) {
 return this.collect(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.collect(Prototype.K);
  },

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

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

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

Object.extend(Enumerable, {
  map:     Enumerable.collect,
  find:    Enumerable.detect,
  select:  Enumerable.findAll,
  member:  Enumerable.include,
  entries: Enumerable.toArray
});
var $A = Array.from = function(iterable) {
  if (!iterable) return [];
  if (iterable.toArray) {
 return iterable.toArray();
  } else {
 var results = [];
 for (var i = 0; i < iterable.length; i++)
   results.push(iterable[i]);
 return results;
  }
}

Object.extend(Array.prototype, Enumerable);

Array.prototype._reverse = Array.prototype.reverse;

Object.extend(Array.prototype, {
  _each: function(iterator) {
 for (var i = 0; i < this.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 != undefined || value != null;
 });
  },

  flatten: function() {
 return this.inject([], function(array, value) {
   return array.concat(value.constructor == Array ?
     value.flatten() : [value]);
 });
  },

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

  indexOf: function(object) {
 for (var i = 0; i < this.length; i++)
   if (this[i] == object) return i;
 return -1;
  },

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

  shift: function() {
 var result = this[0];
 for (var i = 0; i < this.length - 1; i++)
   this[i] = this[i + 1];
 this.length--;
 return result;
  },

  inspect: function() {
 return '[' + this.map(Object.inspect).join(', ') + ']';
  }
});
var Hash = {
  _each: function(iterator) {
 for (key in this) {
   var value = this[key];
   if (typeof value == 'function') continue;

   var pair = [key, value];
   pair.key = key;
   pair.value = value;
   iterator(pair);
 }
  },

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

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

  merge: function(hash) {
 return $H(hash).inject($H(this), function(mergedHash, pair) {
   mergedHash[pair.key] = pair.value;
   return mergedHash;
 });
  },

  toQueryString: function() {
 return this.map(function(pair) {
   return pair.map(encodeURIComponent).join('=');
 }).join('&');
  },

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

function $H(object) {
  var hash = Object.extend({}, object || {});
  Object.extend(hash, Enumerable);
  Object.extend(hash, Hash);
  return hash;
}
ObjectRange = Class.create();
Object.extend(ObjectRange.prototype, Enumerable);
Object.extend(ObjectRange.prototype, {
  initialize: function(start, end, exclusive) {
 this.start = start;
 this.end = end;
 this.exclusive = exclusive;
  },

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

  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 ActiveXObject('Msxml2.XMLHTTP')},
   function() {return new ActiveXObject('Microsoft.XMLHTTP')},
   function() {return new XMLHttpRequest()}
 ) || false;
  },

  activeRequestCount: 0
}

Ajax.Responders = {
  responders: [],

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

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

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

  dispatch: function(callback, request, transport, json) {
 this.each(function(responder) {
   if (responder[callback] && typeof responder[callback] == 'function') {
     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 = function() {};
Ajax.Base.prototype = {
  setOptions: function(options) {
 this.options = {
   method:       'post',
   asynchronous: true,
   parameters:   ''
 }
 Object.extend(this.options, options || {});
  },

  responseIsSuccess: function() {
 return this.transport.status == undefined
     || this.transport.status == 0
     || (this.transport.status >= 200 && this.transport.status < 300);
  },

  responseIsFailure: function() {
 return !this.responseIsSuccess();
  }
}

Ajax.Request = Class.create();
Ajax.Request.Events =
  ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];

Ajax.Request.prototype = Object.extend(new Ajax.Base(), {
  initialize: function(url, options) {
 this.transport = Ajax.getTransport();
 this.setOptions(options);
 this.request(url);
  },

  request: function(url) {
 var parameters = this.options.parameters || '';
 if (parameters.length > 0) parameters += '&_=';

 try {
   this.url = url;
   if (this.options.method == 'get' && parameters.length > 0)
     this.url += (this.url.match(/\?/) ? '&' : '?') + parameters;

   Ajax.Responders.dispatch('onCreate', this, this.transport);

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

   if (this.options.asynchronous) {
     this.transport.onreadystatechange = this.onStateChange.bind(this);
     setTimeout((function() {this.respondToReadyState(1)}).bind(this), 10);
   }

   this.setRequestHeaders();

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

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

  setRequestHeaders: function() {
 var requestHeaders =
   ['X-Requested-With', 'XMLHttpRequest',
    'X-Prototype-Version', Prototype.Version];

 if (this.options.method == 'post') {
   requestHeaders.push('Content-type',
     'application/x-www-form-urlencoded');

   /* Force "Connection: close" for Mozilla browsers to work around
    * a bug where XMLHttpReqeuest sends an incorrect Content-length
    * header. See Mozilla Bugzilla #246651.
    */
   if (this.transport.overrideMimeType)
     requestHeaders.push('Connection', 'close');
 }

 if (this.options.requestHeaders)
   requestHeaders.push.apply(requestHeaders, this.options.requestHeaders);

 for (var i = 0; i < requestHeaders.length; i += 2)
   this.transport.setRequestHeader(requestHeaders[i], requestHeaders[i+1]);
  },

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

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

  evalJSON: function() {
 try {
   return eval(this.header('X-JSON'));
 } catch (e) {}
  },

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

  respondToReadyState: function(readyState) {
 var event = Ajax.Request.Events[readyState];
 var transport = this.transport, json = this.evalJSON();

 if (event == 'Complete') {
   try {
     (this.options['on' + this.transport.status]
      || this.options['on' + (this.responseIsSuccess() ? 'Success' : 'Failure')]
      || Prototype.emptyFunction)(transport, json);
   } catch (e) {
     this.dispatchException(e);
   }

   if ((this.header('Content-type') || '').match(/^text\/javascript/i))
     this.evalResponse();
 }

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

 /* Avoid memory leak in MSIE: clean up the oncomplete event handler */
 if (event == 'Complete')
   this.transport.onreadystatechange = Prototype.emptyFunction;
  },

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

Ajax.Updater = Class.create();

Object.extend(Object.extend(Ajax.Updater.prototype, Ajax.Request.prototype), {
  initialize: function(container, url, options) {
 this.containers = {
   success: container.success ? $(container.success) : $(container),
   failure: container.failure ? $(container.failure) :
     (container.success ? null : $(container))
 }

 this.transport = Ajax.getTransport();
 this.setOptions(options);

 var onComplete = this.options.onComplete || Prototype.emptyFunction;
 this.options.onComplete = (function(transport, object) {
   this.updateContent();
   onComplete(transport, object);
 }).bind(this);

 this.request(url);
  },

  updateContent: function() {
 var receiver = this.responseIsSuccess() ?
   this.containers.success : this.containers.failure;
 var response = this.transport.responseText;

 if (!this.options.evalScripts)
   response = response.stripScripts();

 if (receiver) {
   if (this.options.insertion) {
     new this.options.insertion(receiver, response);
   } else {
     Element.update(receiver, response);
   }
 }

 if (this.responseIsSuccess()) {
   if (this.onComplete)
     setTimeout(this.onComplete.bind(this), 10);
 }
  }
});

Ajax.PeriodicalUpdater = Class.create();
Ajax.PeriodicalUpdater.prototype = Object.extend(new Ajax.Base(), {
  initialize: function(container, url, options) {
 this.setOptions(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.onComplete = undefined;
 clearTimeout(this.timer);
 (this.onComplete || Prototype.emptyFunction).apply(this, arguments);
  },

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

   this.lastText = request.responseText;
 }
 this.timer = setTimeout(this.onTimerEvent.bind(this),
   this.decay * this.frequency * 1000);
  },

  onTimerEvent: function() {
 this.updater = new Ajax.Updater(this.container, this.url, this.options);
  }
});
document.getElementsByClassName = function(className, parentElement) {
  var children = ($(parentElement) || document.body).getElementsByTagName('*');
  return $A(children).inject([], function(elements, child) {
 if (child.className.match(new RegExp("(^|\\s)" + className + "(\\s|$)")))
   elements.push(child);
 return elements;
  });
}

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

if (!window.Element) {
  var Element = new Object();
}

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

  toggle: function() {
 for (var i = 0; i < arguments.length; i++) {
   var element = $(arguments[i]);
   Element[Element.visible(element) ? 'hide' : 'show'](element);
 }
  },

  hide: function() {
 for (var i = 0; i < arguments.length; i++) {
   var element = $(arguments[i]);
   element.style.display = 'none';
 }
  },

  show: function() {
 for (var i = 0; i < arguments.length; i++) {
   var element = $(arguments[i]);
   element.style.display = '';
 }
  },

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

  update: function(element, html) {
 $(element).innerHTML = html.stripScripts();
 setTimeout(function() {html.evalScripts()}, 10);
  },

  getHeight: function(element) {
 element = $(element);
 return element.offsetHeight;
  },

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

  hasClassName: function(element, className) {
 if (!(element = $(element))) return;
 return Element.classNames(element).include(className);
  },

  addClassName: function(element, className) {
 if (!(element = $(element))) return;
 return Element.classNames(element).add(className);
  },

  removeClassName: function(element, className) {
 if (!(element = $(element))) return;
 return Element.classNames(element).remove(className);
  },

  // removes whitespace-only text node children
  cleanWhitespace: function(element) {
 element = $(element);
 for (var i = 0; i < element.childNodes.length; i++) {
   var node = element.childNodes[i];
   if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
     Element.remove(node);
 }
  },

  empty: function(element) {
 return $(element).innerHTML.match(/^\s*$/);
  },

  scrollTo: function(element) {
 element = $(element);
 var x = element.x ? element.x : element.offsetLeft,
     y = element.y ? element.y : element.offsetTop;
 window.scrollTo(x, y);
  },

  getStyle: function(element, style) {
 element = $(element);
 var value = element.style[style.camelize()];
 if (!value) {
   if (document.defaultView && document.defaultView.getComputedStyle) {
     var css = document.defaultView.getComputedStyle(element, null);
     value = css ? css.getPropertyValue(style) : null;
   } else if (element.currentStyle) {
     value = element.currentStyle[style.camelize()];
   }
 }

 if (window.opera && ['left', 'top', 'right', 'bottom'].include(style))
   if (Element.getStyle(element, 'position') == 'static') value = 'auto';

 return value == 'auto' ? null : value;
  },

  setStyle: function(element, style) {
 element = $(element);
 for (name in style)
   element.style[name.camelize()] = style[name];
  },

  getDimensions: function(element) {
 element = $(element);
 if (Element.getStyle(element, 'display') != 'none')
   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;
 els.visibility = 'hidden';
 els.position = 'absolute';
 els.display = '';
 var originalWidth = element.clientWidth;
 var originalHeight = element.clientHeight;
 els.display = 'none';
 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;
   }
 }
  },

  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 = '';
 }
  },

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

  undoClipping: function(element) {
 element = $(element);
 if (element._overflow) return;
 element.style.overflow = element._overflow;
 element._overflow = undefined;
  }
});

var Toggle = new Object();
Toggle.display = Element.toggle;

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

Abstract.Insertion = function(adjacency) {
  this.adjacency = adjacency;
}

Abstract.Insertion.prototype = {
  initialize: function(element, content) {
 this.element = $(element);
 this.content = content.stripScripts();

 if (this.adjacency && this.element.insertAdjacentHTML) {
   try {
     this.element.insertAdjacentHTML(this.adjacency, this.content);
   } catch (e) {
     if (this.element.tagName.toLowerCase() == 'tbody') {
       this.insertContent(this.contentFromAnonymousTable());
     } else {
       throw e;
     }
   }
 } else {
   this.range = this.element.ownerDocument.createRange();
   if (this.initializeRange) this.initializeRange();
   this.insertContent([this.range.createContextualFragment(this.content)]);
 }

 setTimeout(function() {content.evalScripts()}, 10);
  },

  contentFromAnonymousTable: function() {
 var div = document.createElement('div');
 div.innerHTML = '<table><tbody>' + this.content + '</tbody></table>';
 return $A(div.childNodes[0].childNodes[0].childNodes);
  }
}

var Insertion = new Object();

Insertion.Before = Class.create();
Insertion.Before.prototype = Object.extend(new Abstract.Insertion('beforeBegin'), {
  initializeRange: function() {
 this.range.setStartBefore(this.element);
  },

  insertContent: function(fragments) {
 fragments.each((function(fragment) {
   this.element.parentNode.insertBefore(fragment, this.element);
 }).bind(this));
  }
});

Insertion.Top = Class.create();
Insertion.Top.prototype = Object.extend(new Abstract.Insertion('afterBegin'), {
  initializeRange: function() {
 this.range.selectNodeContents(this.element);
 this.range.collapse(true);
  },

  insertContent: function(fragments) {
 fragments.reverse(false).each((function(fragment) {
   this.element.insertBefore(fragment, this.element.firstChild);
 }).bind(this));
  }
});

Insertion.Bottom = Class.create();
Insertion.Bottom.prototype = Object.extend(new Abstract.Insertion('beforeEnd'), {
  initializeRange: function() {
 this.range.selectNodeContents(this.element);
 this.range.collapse(this.element);
  },

  insertContent: function(fragments) {
 fragments.each((function(fragment) {
   this.element.appendChild(fragment);
 }).bind(this));
  }
});

Insertion.After = Class.create();
Insertion.After.prototype = Object.extend(new Abstract.Insertion('afterEnd'), {
  initializeRange: function() {
 this.range.setStartAfter(this.element);
  },

  insertContent: function(fragments) {
 fragments.each((function(fragment) {
   this.element.parentNode.insertBefore(fragment,
     this.element.nextSibling);
 }).bind(this));
  }
});

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

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(this.toArray().concat(classNameToAdd).join(' '));
  },

  remove: function(classNameToRemove) {
 if (!this.include(classNameToRemove)) return;
 this.set(this.select(function(className) {
   return className != classNameToRemove;
 }).join(' '));
  },

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

Object.extend(Element.ClassNames.prototype, Enumerable);
var Field = {
  clear: function() {
 for (var i = 0; i < arguments.length; i++)
   $(arguments[i]).value = '';
  },

  focus: function(element) {
 $(element).focus();
  },

  present: function() {
 for (var i = 0; i < arguments.length; i++)
   if ($(arguments[i]).value == '') return false;
 return true;
  },

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

  activate: function(element) {
 element = $(element);
 element.focus();
 if (element.select)
   element.select();
  }
}

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

var Form = {
  serialize: function(form) {
 var elements = Form.getElements($(form));
 var queryComponents = new Array();

 for (var i = 0; i < elements.length; i++) {
   var queryComponent = Form.Element.serialize(elements[i]);
   if (queryComponent)
     queryComponents.push(queryComponent);
 }

 return queryComponents.join('&');
  },

  getElements: function(form) {
 form = $(form);
 var elements = new Array();

 for (tagName in Form.Element.Serializers) {
   var tagElements = form.getElementsByTagName(tagName);
   for (var j = 0; j < tagElements.length; j++)
     elements.push(tagElements[j]);
 }
 return elements;
  },

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

 if (!typeName && !name)
   return inputs;

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

 return matchingInputs;
  },

  disable: function(form) {
 var elements = Form.getElements(form);
 for (var i = 0; i < elements.length; i++) {
   var element = elements[i];
   element.blur();
   element.disabled = 'true';
 }
  },

  enable: function(form) {
 var elements = Form.getElements(form);
 for (var i = 0; i < elements.length; i++) {
   var element = elements[i];
   element.disabled = '';
 }
  },

  findFirstElement: function(form) {
 return Form.getElements(form).find(function(element) {
   return element.type != 'hidden' && !element.disabled &&
     ['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
 });
  },

  focusFirstElement: function(form) {
 Field.activate(Form.findFirstElement(form));
  },

  reset: function(form) {
 $(form).reset();
  }
}

Form.Element = {
  serialize: function(element) {
 element = $(element);
 var method = element.tagName.toLowerCase();
 var parameter = Form.Element.Serializers[method](element);

 if (parameter) {
   var key = encodeURIComponent(parameter[0]);
   if (key.length == 0) return;

   if (parameter[1].constructor != Array)
     parameter[1] = [parameter[1]];

   return parameter[1].map(function(value) {
     return key + '=' + encodeURIComponent(value);
   }).join('&');
 }
  },

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

 if (parameter)
   return parameter[1];
  }
}

Form.Element.Serializers = {
  input: function(element) {
 switch (element.type.toLowerCase()) {
   case 'submit':
   case 'hidden':
   case 'password':
   case 'text':
     return Form.Element.Serializers.textarea(element);
   case 'checkbox':
   case 'radio':
     return Form.Element.Serializers.inputSelector(element);
 }
 return false;
  },

  inputSelector: function(element) {
 if (element.checked)
   return [element.name, element.value];
  },

  textarea: function(element) {
 return [element.name, element.value];
  },

  select: function(element) {
 return Form.Element.Serializers[element.type == 'select-one' ?
   'selectOne' : 'selectMany'](element);
  },

  selectOne: function(element) {
 var value = '', opt, index = element.selectedIndex;
 if (index >= 0) {
   opt = element.options[index];
   value = opt.value;
   if (!value && !('value' in opt))
     value = opt.text;
 }
 return [element.name, value];
  },

  selectMany: function(element) {
 var value = new Array();
 for (var i = 0; i < element.length; i++) {
   var opt = element.options[i];
   if (opt.selected) {
     var optValue = opt.value;
     if (!optValue && !('value' in opt))
       optValue = opt.text;
     value.push(optValue);
   }
 }
 return [element.name, value];
  }
}

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

var $F = Form.Element.getValue;

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

Abstract.TimedObserver = function() {}
Abstract.TimedObserver.prototype = {
  initialize: function(element, frequency, callback) {
 this.frequency = frequency;
 this.element   = $(element);
 this.callback  = callback;

 this.lastValue = this.getValue();
 this.registerCallback();
  },

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

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

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

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

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

Abstract.EventObserver = function() {}
Abstract.EventObserver.prototype = {
  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() {
 var elements = Form.getElements(this.element);
 for (var i = 0; i < elements.length; i++)
   this.registerCallback(elements[i]);
  },

  registerCallback: function(element) {
 if (element.type) {
   switch (element.type.toLowerCase()) {
     case 'checkbox':
     case 'radio':
       Event.observe(element, 'click', this.onElementEvent.bind(this));
       break;
     case 'password':
     case 'text':
     case 'textarea':
     case 'select-one':
     case 'select-multiple':
       Event.observe(element, 'change', this.onElementEvent.bind(this));
       break;
   }
 }
  }
}

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

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

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,

  element: function(event) {
 return event.target || event.srcElement;
  },

  isLeftClick: function(event) {
 return (((event.which) && (event.which == 1)) ||
         ((event.button) && (event.button == 1)));
  },

  pointerX: function(event) {
 return event.pageX || (event.clientX +
   (document.documentElement.scrollLeft || document.body.scrollLeft));
  },

  pointerY: function(event) {
 return event.pageY || (event.clientY +
   (document.documentElement.scrollTop || document.body.scrollTop));
  },

  stop: function(event) {
 if (event.preventDefault) {
   event.preventDefault();
   event.stopPropagation();
 } else {
   event.returnValue = false;
   event.cancelBubble = true;
 }
  },

  // find the first node with the given tagName, starting from the
  // node the event was triggered on; traverses the DOM upwards
  findElement: function(event, tagName) {
 var element = Event.element(event);
 while (element.parentNode && (!element.tagName ||
     (element.tagName.toUpperCase() != tagName.toUpperCase())))
   element = element.parentNode;
 return element;
  },

  observers: false,

  _observeAndCache: function(element, name, observer, useCapture) {
 if (!this.observers) this.observers = [];
 if (element.addEventListener) {
   this.observers.push([element, name, observer, useCapture]);
   element.addEventListener(name, observer, useCapture);
 } else if (element.attachEvent) {
   this.observers.push([element, name, observer, useCapture]);
   element.attachEvent('on' + name, observer);
 }
  },

  unloadCache: function() {
 if (!Event.observers) return;
 for (var i = 0; i < Event.observers.length; i++) {
   Event.stopObserving.apply(this, Event.observers[i]);
   Event.observers[i][0] = null;
 }
 Event.observers = false;
  },

  observe: function(element, name, observer, useCapture) {
 var element = $(element);
 useCapture = useCapture || false;

 if (name == 'keypress' &&
     (navigator.appVersion.match(/Konqueror|Safari|KHTML/)
     || element.attachEvent))
   name = 'keydown';

 this._observeAndCache(element, name, observer, useCapture);
  },

  stopObserving: function(element, name, observer, useCapture) {
 var element = $(element);
 useCapture = useCapture || false;

 if (name == 'keypress' &&
     (navigator.appVersion.match(/Konqueror|Safari|KHTML/)
     || element.detachEvent))
   name = 'keydown';

 if (element.removeEventListener) {
   element.removeEventListener(name, observer, useCapture);
 } else if (element.detachEvent) {
   element.detachEvent('on' + name, observer);
 }
  }
});

/* prevent memory leaks in IE */
Event.observe(window, 'unload', Event.unloadCache, false);
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;
  },

  realOffset: function(element) {
 var valueT = 0, valueL = 0;
 do {
   valueT += element.scrollTop  || 0;
   valueL += element.scrollLeft || 0;
   element = element.parentNode;
 } while (element);
 return [valueL, valueT];
  },

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

  positionedOffset: function(element) {
 var valueT = 0, valueL = 0;
 do {
   valueT += element.offsetTop  || 0;
   valueL += element.offsetLeft || 0;
   element = element.offsetParent;
   if (element) {
     p = Element.getStyle(element, 'position');
     if (p == 'relative' || p == 'absolute') break;
   }
 } while (element);
 return [valueL, valueT];
  },

  offsetParent: 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;
  },

  // 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 = this.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 = this.realOffset(element);

 this.xcomp = x + offsetcache[0] - this.deltaX;
 this.ycomp = y + offsetcache[1] - this.deltaY;
 this.offset = this.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;
  },

  clone: function(source, target) {
 source = $(source);
 target = $(target);
 target.style.position = 'absolute';
 var offsets = this.cumulativeOffset(source);
 target.style.top    = offsets[1] + 'px';
 target.style.left   = offsets[0] + 'px';
 target.style.width  = source.offsetWidth + 'px';
 target.style.height = source.offsetHeight + 'px';
  },

  page: 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)
     if (Element.getStyle(element,'position')=='absolute') break;

 } while (element = element.offsetParent);

 element = forElement;
 do {
   valueT -= element.scrollTop  || 0;
   valueL -= element.scrollLeft || 0;
 } while (element = element.parentNode);

 return [valueL, valueT];
  },

  clone: function(source, target) {
 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 = Position.page(source);

 // find coordinate system to use
 target = $(target);
 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(target,'position') == 'absolute') {
   parent = Position.offsetParent(target);
   delta = Position.page(parent);
 }

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

  absolutize: function(element) {
 element = $(element);
 if (element.style.position == 'absolute') return;
 Position.prepare();

 var offsets = Position.positionedOffset(element);
 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';;
  },

  relativize: function(element) {
 element = $(element);
 if (element.style.position == 'relative') return;
 Position.prepare();

 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;
  }
}

// Safari returns margins on body which is incorrect if the child is absolutely
// positioned.  For performance reasons, redefine Position.cumulativeOffset for
// KHTML/WebKit only.
if (/Konqueror|Safari|KHTML/.test(navigator.userAgent)) {
  Position.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 [valueL, valueT];
  }
}