/*  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];
  }
}