/* Copyright (C) 1999-2006 Tickle Inc. */




var photoUploadMaxPhotos = 30;


var photoUploadNumUploaded = 0;


var photoUploadStatuses = new Array();


var photoUploadDonePhotoIds = new Array();


var photoUploadDisableRowThumbs = false;


var photoUploadImageProcessingStates = new Array();


function photoUploadSetMaxPhotos(maxPhotos) {
  photoUploadMaxPhotos = maxPhotos;
}


function photoUploadEnableInputsOnload() {
  for (var i = 1; i <= photoUploadMaxPhotos; i++) {
    if (photoUploadStatuses[i] == null) {
      _('photo_' + i).disabled = '';
    }
  }
}


function photoUploadHandleFile(photoInput) {
  if (photoInput.value == '') { // ensure a file has been selected
    return;
  }

  
  photoUploadShowUploadingState();

  
  var num = photoUploadGetPhotoNum(photoInput.id);
  Element.hide('photoThumb_' + num);
  photoUploadSetStatus(num, 'uploading');

  
  var isDuplicate = photoUploadIsDuplicate(num);

  if (isDuplicate) {
    
    photoUploadCallback('fake_' + num, 'error', 'duplicate');
  }
  else {
    
    photoUploadAddFrameListener(num);

    
    photoInput.form.submit();

    photoUploadAfterPhotoSelect(num);
  }

  
  photoInput.blur();
  photoInput.disabled = 'true';
}


function photoUploadAddFrameListener(num) {
  var iframe = _('photoFrame_' + num);
  if (iframe.readyState == null) { 
    iframe.readyState = 1;
    
    iframe.addEventListener("load", function() {
      iframe.readyState = 4;
      photoUploadHandleFrameLoad(num);
    }, false);
  }
  else { 
    iframe.onreadystatechange = photoUploadHandleFrameLoad;
  }
}


function photoUploadHandleFrameLoad(num) {
  if (num == null) { 
    num = photoUploadGetPhotoNum(this.id); 
  }
  var iframe = _('photoFrame_' + num);

  
  if (iframe.readyState == 4 || iframe.readyState == 'complete') {
    var status = photoUploadStatuses[num];
    if (status != 'finished' && status != 'error') {
      
      photoUploadCallback('fake_' + num, 'error', 'unknown');
    }
  }
}


function photoUploadCallback(windowName, result, data) {
  var num = photoUploadGetPhotoNum(windowName);
  if (result == 'success') {
    photoUploadNumUploaded++;
    var split = data.split('|');
    photoUploadDonePhotoIds.push(split[0]);
    _('photoThumb_' + num).src = split[1];
    if (!photoUploadDisableRowThumbs) {
      Element.show('photoThumb_' + num);
    }
    photoUploadSetStatus(num, 'finished');

    
    photoUploadImageProcessingStates[num] =  
      new PhotoUploadImageData(num, split[0], split[2]);

    photoUploadHandleDonePhoto(num);
  }
  else if (result == 'error') {
    photoUploadSetStatus(num, 'error');
    if (data == 'unknown') {
      Element.show('photoStatus_unknown_' + num);
    }
    else if (data == 'tooLarge') {
      Element.show('photoStatus_tooLarge_' + num);
    }
    else if (data == 'invalid') {
      Element.show('photoStatus_invalid_' + num);
    }
    else if (data == 'duplicate') {
      Element.show('photoStatus_duplicate_' + num);
    }
    else if (data == 'photoLimitExceeded') {
      Element.show('photoStatus_photoLimitExceeded_' + num);
    }
  }

  photoUploadAfterPhotoComplete(num);

  if (photoUploadCheckDone()) {
    if (photoUploadNumUploaded > 0) { 
      photoUploadShowFinishedState();
    }
    else {
      photoUploadShowDefaultState();
    }
  }
}

function photoUploadAfterPhotoSelect(num) {
  
}

function photoUploadAfterPhotoComplete(num) {
  
}


function photoUploadIsDuplicate(num) {
  var fileName = _('photo_' + num).value;

  var isDuplicate = false;
  for (var i = 1; i <= photoUploadMaxPhotos; i++) {
    if (i != num) {
      var other = _('photo_' + i);
      
      if (other == null) {
        continue;
      }
      if (other.value == fileName &&
          (photoUploadStatuses[i] == 'finished' || 
           photoUploadStatuses[i] == 'uploading')) {
        return true;
      }
    }
  }
  return false;
}


function photoUploadCheckDone() {
  var allDone = true;
  for (var i = 1; i <= photoUploadMaxPhotos; i++) {
    if (photoUploadStatuses[i] == 'uploading') {
      return false;
    }
  }
  return true;
}

function photoUploadGetNumUploading() {
  var count = 0;
  for (var i = 1; i <= photoUploadMaxPhotos; i++) {
    var next = _('photoItem_' + i);
    
    if (next == null) {
      continue;
    }
    if (photoUploadStatuses[i] == 'uploading') {
      count++;
    }
  }
  return count;
}

function photoUploadGetNumAvailable() {
  var count = 0;
  for (var i = 1; i <= photoUploadMaxPhotos; i++) {
    var next = _('photoItem_' + i);
    
    if (next == null) {
      continue;
    }
    if (next.style.display != 'none' && photoUploadStatuses[i] == null) {
      count++;
    }
  }
  return count;
}


function photoUploadGetNumUploadingOrAvailable() {
  return photoUploadGetNumUploading() + photoUploadGetNumAvailable();
}


function photoUploadSubmitAll() {
  for (var i = 1; i <= photoUploadMaxPhotos; i++) {
    uploadPhoto(_('photo_' + i));
  }
}


function photoUploadGetPhotoNum(str) {
  var index = str.lastIndexOf('_');
  return (index == -1) ? '' : str.substring(index + 1, str.length);
}


function photoUploadSetStatus(num, status) {
  if (status == 'uploading') {
    if (hasFlash()) {
      _('photoStatus_uploading_' + num + '_icon').innerHTML =
        writeFlashObject('http://i.ringo.com/img/waitingTransparent.swf', 
                         16, 
                         16, 
                         'http://',
                         "transparent");
    }
    else {
      _('photoStatus_uploading_' + num + '_icon').innerHTML =
       '<img src="http://i.ringo.com/img/star.gif" />';
    }
    Element.show('photoStatus_uploading_' + num);
    Element.hide('photoStatus_finished_' + num);
  }
  else if (status == 'finished') {
    _('photoStatus_finished_' + num + '_icon').innerHTML =
     '<img src="http://i.ringo.com/img/icon/checkGreenForForm.gif" />';
    Element.hide('photoStatus_uploading_' + num);
    Element.show('photoStatus_finished_' + num);
  }
  else if (status == 'error') {
    Element.hide('photoStatus_uploading_' + num);
    Element.hide('photoStatus_finished_' + num);
  }
  
  Element.hide('photoStatus_unknown_' + num);
  Element.hide('photoStatus_tooLarge_' + num);
  Element.hide('photoStatus_invalid_' + num);
  Element.hide('photoStatus_duplicate_' + num);
  Element.hide('photoStatus_photoLimitExceeded_' + num);
  photoUploadStatuses[num] = status;
}


function photoUploadShowNextInput() {
  var allUsed = true;
  for (var i = 1; i <= photoUploadMaxPhotos; i++) {
    if (photoUploadStatuses[i] != 'error' && 
        photoUploadStatuses[i] != 'finished') {
      allUsed = false;
      break;
    }
  }

  if (allUsed) {
    photoUploadShowExhaustedState();
    return;
  }

  for (var i = 1; i <= photoUploadMaxPhotos; i++) {
    var next = _('photoItem_' + i);
    
    if (next == null) {
      continue;
    }
    if (next.style.display == 'none') {
      Element.show(next);
      photoUploadAfterShowNextInput();
      break;
    }
  }
}

function photoUploadAfterShowNextInput() {
  
  window.scrollBy(0, 60);
}

function photoUploadShowDefaultState(photosUploaded) {
  
}

function photoUploadShowUploadingState() {
  
}

function photoUploadShowFinishedState() {
  
}

function photoUploadShowExhaustedState() {
  
}







function PhotoUploadImageData(num, id, liveStatus) {
  this.num = num;
  this.id = id;
  this.isLive = liveStatus;
  this.statusUrl = prefixQueryParams('/photos/upload/statusframe.html') +
                    'photoId=' + id;
  this.deleteUrl = prefixQueryParams('/photos/pending/delete.html') +
                    'pendingPhotoId=' + id;
  this.tries = 0;
  this.timer = null;
  photoUploadSetCheckImageStatus(this);
}

 
function photoUploadSetCheckImageStatus(imageProcessingData) {
  
  if (imageProcessingData.isLive || imageProcessingData.tries > 5) {
    if (imageProcessingData.timer != null) {
      clearTimeout(imageProcessingData.timer);
    }
    imageProcessingData.timer = null;
    return;
  }

  var photoUploadCheckImageStatusFn = (function() {
    photoUploadCheckImageStatus(imageProcessingData);
  });
  
  
  var delaySec = Math.pow(imageProcessingData.tries + 1, 2) + 2;

  imageProcessingData.timer = 
    setTimeout(photoUploadCheckImageStatusFn, 1000 * delaySec);
}


function photoUploadCheckImageStatus(imageProcessingData) {
  r = new Ajax.Request(imageProcessingData.statusUrl, { 
    onComplete : function(transport) { 
      photoUploadCheckImageStatusAjaxCallback(transport, imageProcessingData); 
    } 
  });
}


function photoUploadCheckImageStatusAjaxCallback(transport, 
                                                 imageProcessingData) {
  if (transport.status != 200) {
    
    throw new Error('bad transport status: ' + transport.status);
  }

  var xml = transport.responseXML;
  if (xml == null) {
    throw new Error('no XML in response');
  }

  var resultNode = xml.getElementsByTagName("result")[0];

  if (resultNode.firstChild) {
    var thumbSrcUrl = resultNode.firstChild.nodeValue;
    imageProcessingData.isLive = true;

    // update the IMG tag
    if (!photoUploadDisableRowThumbs) {
      var thumb = _('photoThumb_' + imageProcessingData.num);
      if (thumb != null) {
        thumb.src = thumbSrcUrl;
      }
    }

    var doneThumbId = 'donePhotoThumb_' + imageProcessingData.id;
    var doneThumb = _(doneThumbId);
    if (doneThumb != null) {
      doneThumb.src = thumbSrcUrl;
    }
  }

  imageProcessingData.tries++;
  photoUploadSetCheckImageStatus(imageProcessingData);
}

function photoUploadGetDonePhotoId(num) {
  var data = photoUploadImageProcessingStates[num];
  if (data == null) {
    return null;
  }

  return data.id;
}

function photoUploadGetDonePhotoDeleteUrl(num) {
  var data = photoUploadImageProcessingStates[num];
  if (data == null) {
    return null;
  }

  return data.deleteUrl;
}

function photoUploadHandleDonePhoto(num) {
  photoUploadHandleDonePhotoIdsChange();
}

function photoUploadHandleDonePhotoIdsChange() {
  photoUploadHandleDonePhotoIds(photoUploadDonePhotoIds);
}

function photoUploadHandleDonePhotoIds() {
  
}/*  Prototype JavaScript framework, version 1.4.0_pre2
 *  (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_pre2',
  emptyFunction: function() {}
}

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.prototype.extend = function(object) {
  return Object.extend.apply(this, [this, object]);
}
*/

Function.prototype.bind = function(object) {
  var __method = this;
  return function() {
    return __method.apply(object, arguments);
  }
}

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

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

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;
}

if (!Array.prototype.push) {
  Array.prototype.push = function() {
		var startLength = this.length;
		for (var i = 0; i < arguments.length; i++)
      this[startLength + i] = arguments[i];
	  return this.length;
  }
}

if (!Function.prototype.apply) {
  // Based on code from http://www.youngpup.net/
  Function.prototype.apply = function(object, parameters) {
    var parameterStrings = new Array();
    if (!object)     object = window;
    if (!parameters) parameters = new Array();
    
    for (var i = 0; i < parameters.length; i++)
      parameterStrings[i] = 'parameters[' + i + ']';
    
    object.__apply__ = this;
    var result = eval('object.__apply__(' + 
      parameterStrings.join(', ') + ')');
    object.__apply__ = null;
    
    return result;
  }
}

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

  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].nodeValue;
  }
});

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

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 {
      if (this.options.method == 'get')
        url += '?' + parameters;

      this.transport.open(this.options.method, 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) {
    }
  },

  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);
  },

  respondToReadyState: function(readyState) {
    var event = Ajax.Request.Events[readyState];

    if (event == 'Complete')
      (this.options['on' + this.transport.status]
       || this.options['on' + (this.responseIsSuccess() ? 'Success' : 'Failure')]
       || Prototype.emptyFunction)(this.transport);

    (this.options['on' + event] || Prototype.emptyFunction)(this.transport);

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

Ajax.Updater = Class.create();
Ajax.Updater.ScriptFragment = '(?:<script.*?>)((\n|.)*?)(?:<\/script>)';

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() {
      this.updateContent();
      onComplete(this.transport);
    }).bind(this);

    this.request(url);
  },

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

    var match    = new RegExp(Ajax.Updater.ScriptFragment, 'img');
    var response = this.transport.responseText.replace(match, '');
    var scripts  = this.transport.responseText.match(match);

    if (receiver) {
      if (this.options.insertion) {
        new this.options.insertion(receiver, response);
      } else {
        receiver.innerHTML = response;
      }
    }

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

    if (this.options.evalScripts && scripts) {
      match = new RegExp(Ajax.Updater.ScriptFragment, 'im');
      setTimeout((function() {
        for (var i = 0; i < scripts.length; i++)
          eval(scripts[i].match(match)[1]);
      }).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 = 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 || Ajax.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) {
  var children = document.getElementsByTagName('*') || document.all;
  var elements = new Array();
  
  for (var i = 0; i < children.length; i++) {
    var child = children[i];
    var classNames = child.className.split(' ');
    for (var j = 0; j < classNames.length; j++) {
      if (classNames[j] == className) {
        elements.push(child);
        break;
      }
    }
  }
  
  return elements;
}

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

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

Object.extend(Element, {
  toggle: function() {
    for (var i = 0; i < arguments.length; i++) {
      var element = _(arguments[i]);
      element.style.display = 
        (element.style.display == 'none' ? '' : 'none');
    }
  },

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

  hasClassName: function(element, className) {
    element = _(element);
    if (!element)
      return;
    var a = element.className.split(' ');
    for (var i = 0; i < a.length; i++) {
      if (a[i] == className)
        return true;
    }
    return false;
  },

  addClassName: function(element, className) {
    element = _(element);
    Element.removeClassName(element, className);
    element.className += ' ' + className;
  },

  removeClassName: function(element, className) {
    element = _(element);
    if (!element)
      return;
    var newClassName = '';
    var a = element.className.split(' ');
    for (var i = 0; i < a.length; i++) {
      if (a[i] != className) {
        if (i > 0)
          newClassName += ' ';
        newClassName += a[i];
      }
    }
    element.className = newClassName;
  },
  
  // removes whitespace-only text node children
  cleanWhitespace: function(element) {
    var 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);
    }
  }
});

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;
    
    if (this.adjacency && this.element.insertAdjacentHTML) {
      this.element.insertAdjacentHTML(this.adjacency, this.content);
    } else {
      this.range = this.element.ownerDocument.createRange();
      if (this.initializeRange) this.initializeRange();
      this.fragment = this.range.createContextualFragment(this.content);
      this.insertContent();
    }
  }
}

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() {
    this.element.parentNode.insertBefore(this.fragment, this.element);
  }
});

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() {  
    this.element.insertBefore(this.fragment, this.element.firstChild);
  }
});

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() {
    this.element.appendChild(this.fragment);
  }
});

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

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).focus();
    _(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) {
    var 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) {
    var 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 = '';
    }
  },

  focusFirstElement: function(form) {
    var form = _(form);
    var elements = Form.getElements(form);
    for (var i = 0; i < elements.length; i++) {
      var element = elements[i];
      if (element.type != 'hidden' && !element.disabled) {
        Field.activate(element);
        break;
      }
    }
  },

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

Form.Element = {
  serialize: function(element) {
    var element = _(element);
    var method = element.tagName.toLowerCase();
    var parameter = Form.Element.Serializers[method](element);
    
    if (parameter)
      return encodeURIComponent(parameter[0]) + '=' + 
        encodeURIComponent(parameter[1]);                   
  },
  
  getValue: function(element) {
    var 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) {
    var value = '';
    if (element.type == 'select-one') {
      var index = element.selectedIndex;
      if (index >= 0)
        value = element.options[index].value || element.options[index].text;
    } else {
      value = new Array();
      for (var i = 0; i < element.length; i++) {
        var opt = element.options[i];
        if (opt.selected)
          value.push(opt.value || opt.text);
      }
    }
    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':
          element.target = this;
          element.prev_onclick = element.onclick || Prototype.emptyFunction;
          element.onclick = function() {
            this.prev_onclick(); 
            this.target.onElementEvent();
          }
          break;
        case 'password':
        case 'text':
        case 'textarea':
        case 'select-one':
        case 'select-multiple':
          element.target = this;
          element.prev_onchange = element.onchange || Prototype.emptyFunction;
          element.onchange = function() {
            this.prev_onchange(); 
            this.target.onElementEvent();
          }
          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;
    }
  },

  // 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.indexOf('AppleWebKit') > 0) 
        || 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.indexOf('AppleWebKit') > 0) 
        || 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];
  },

  // 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';
  }
}