if (!window.Modalbox)
       var Modalbox = new Object();

Modalbox.Methods = {
       overrideAlert: false, // Override standard browser alert message with ModalBox
       focusableElements: new Array,
       currFocused: 0,
       initialized: false,
       active: true,
       options: {
              title: "ModalBox Window", // Title of the ModalBox window
              overlayClose: true, // Close modal box by clicking on overlay
              width: 500, // Default width in px
              height: 90, // Default height in px
              overlayOpacity: .65, // Default overlay opacity
              overlayDuration: .25, // Default overlay fade in/out duration in seconds
              slideDownDuration: .5, // Default Modalbox appear slide down effect in seconds
              slideUpDuration: .5, // Default Modalbox hiding slide up effect in seconds
              resizeDuration: .25, // Default resize duration seconds
              inactiveFade: true, // Fades MB window on inactive state
              transitions: true, // Toggles transition effects. Transitions are enabled by default
              loadingString: "Please wait. Loading...", // Default loading string message
              closeString: "Close window", // Default title attribute for close window link
              closeValue: "×", // Default string for close link in the header
              params: {},
              method: 'get', // Default Ajax request method
              autoFocusing: true, // Toggles auto-focusing for form elements. Disable for long text pages.
              aspnet: false // Should be use then using with ASP.NET costrols. Then true Modalbox window will be injected into the first form element.
       },
       _options: new Object,

       setOptions: function(options) {
              Object.extend(this.options, options || {});
       },

       _init: function(options) {
              // Setting up original options with default options
              Object.extend(this._options, this.options);
              this.setOptions(options);

              //Create the overlay
              this.MBoverlay = new Element("div", { id: "MB_overlay", opacity: "0" });

              //Create DOm for the window
              this.MBwindow = new Element("div", {id: "MB_window", style: "display: none"}).update(
                     this.MBframe = new Element("div", {id: "MB_frame"}).update(
                            this.MBheader = new Element("div", {id: "MB_header"}).update(
                                   this.MBcaption = new Element("div", {id: "MB_caption"})
                            )
                     )
              );
              this.MBclose = new Element("a", {id: "MB_close", title: this.options.closeString, href: "#"}).update("<span>" + this.options.closeValue + "</span>");
              this.MBheader.insert({'bottom':this.MBclose});

              this.MBcontent = new Element("div", {id: "MB_content"}).update(
                     this.MBloading = new Element("div", {id: "MB_loading"}).update(this.options.loadingString)
              );
              this.MBframe.insert({'bottom':this.MBcontent});

              // Inserting into DOM. If parameter set and form element have been found will inject into it. Otherwise will inject into body as topmost element.
              // Be sure to set padding and marging to null via CSS for both body and (in case of asp.net) form elements.
              var injectToEl = this.options.aspnet ? $(document.body).down('form') : $(document.body);
              injectToEl.insert({'top':this.MBwindow});
              injectToEl.insert({'top':this.MBoverlay});

              // Initial scrolling position of the window. To be used for remove scrolling effect during ModalBox appearing
              this.initScrollX = window.pageXOffset || document.body.scrollLeft || document.documentElement.scrollLeft;
              this.initScrollY = window.pageYOffset || document.body.scrollTop || document.documentElement.scrollTop;

              //Adding event observers
              this.hideObserver = this._hide.bindAsEventListener(this);
              this.kbdObserver = this._kbdHandler.bindAsEventListener(this);
              this._initObservers();

              this.initialized = true; // Mark as initialized
       },

       show: function(content, options) {
              if(!this.initialized) this._init(options); // Check for is already initialized

              this.content = content;
              this.setOptions(options);

              if(this.options.title) // Updating title of the MB
                     $(this.MBcaption).update(this.options.title);
              else { // If title isn't given, the header will not displayed
                     $(this.MBheader).hide();
                     $(this.MBcaption).hide();
              }

              if(this.MBwindow.style.display == "none") { // First modal box appearing
                     this._appear();
                     this.event("onShow"); // Passing onShow callback
              }
              else { // If MB already on the screen, update it
                     this._update();
                     this.event("onUpdate"); // Passing onUpdate callback
              }
       },

       hide: function(options) { // External hide method to use from external HTML and JS
              if(this.initialized) {
                     // Reading for options/callbacks except if event given as a pararmeter
                     if(options && typeof options.element != 'function') Object.extend(this.options, options);
                     // Passing beforeHide callback
                     this.event("beforeHide");
                     if(this.options.transitions)
                            Effect.SlideUp(this.MBwindow, { duration: this.options.slideUpDuration, transition: Effect.Transitions.sinoidal, afterFinish: this._deinit.bind(this) } );
                     else {
                            $(this.MBwindow).hide();
                            this._deinit();
                     }
              } else throw("Modalbox is not initialized.");
       },

       _hide: function(event) { // Internal hide method to use with overlay and close link
              event.stop(); // Stop event propaganation for link elements
              /* Then clicked on overlay we'll check the option and in case of overlayClose == false we'll break hiding execution [Fix for #139] */
              if(event.element().id == 'MB_overlay' && !this.options.overlayClose) return false;
              this.hide();
       },

       alert: function(message){
              var html = '<div class="MB_alert"><p>' + message + '</p><input type="button" onclick="Modalbox.hide()" value="OK" /></div>';
              Modalbox.show(html, {title: 'Alert: ' + document.title, width: 300});
       },

       _appear: function() { // First appearing of MB
              if(Prototype.Browser.IE && !navigator.appVersion.match(/\b7.0\b/)) { // Preparing IE 6 for showing modalbox
                     window.scrollTo(0,0);
                     this._prepareIE("100%", "hidden");
              }
              this._setWidth();
              this._setPosition();
              if(this.options.transitions) {
                     $(this.MBoverlay).setStyle({opacity: 0});
                     new Effect.Fade(this.MBoverlay, {
                                   from: 0,
                                   to: this.options.overlayOpacity,
                                   duration: this.options.overlayDuration,
                                   afterFinish: function() {
                                          new Effect.SlideDown(this.MBwindow, {
                                                 duration: this.options.slideDownDuration,
                                                 transition: Effect.Transitions.sinoidal,
                                                 afterFinish: function(){
                                                        this._setPosition();
                                                        this.loadContent();
                                                 }.bind(this)
                                          });
                                   }.bind(this)
                     });
              } else {
                     $(this.MBoverlay).setStyle({opacity: this.options.overlayOpacity});
                     $(this.MBwindow).show();
                     this._setPosition();
                     this.loadContent();
              }
              this._setWidthAndPosition = this._setWidthAndPosition.bindAsEventListener(this);
              Event.observe(window, "resize", this._setWidthAndPosition);
       },

       resize: function(byWidth, byHeight, options) { // Change size of MB without loading content
              var wHeight = $(this.MBwindow).getHeight();
              var wWidth = $(this.MBwindow).getWidth();
              var hHeight = $(this.MBheader).getHeight();
              var cHeight = $(this.MBcontent).getHeight();
              var newHeight = ((wHeight - hHeight + byHeight) < cHeight) ? (cHeight + hHeight - wHeight) : byHeight;
              if(options) this.setOptions(options); // Passing callbacks
              if(this.options.transitions) {
                     new Effect.ScaleBy(this.MBwindow, byWidth, newHeight, {
                                   duration: this.options.resizeDuration,
                                     afterFinish: function() {
                                          this.event("_afterResize"); // Passing internal callback
                                          this.event("afterResize"); // Passing callback
                                   }.bind(this)
                            });
              } else {
                     this.MBwindow.setStyle({width: wWidth + byWidth + "px", height: wHeight + newHeight + "px"});
                     setTimeout(function() {
                            this.event("_afterResize"); // Passing internal callback
                            this.event("afterResize"); // Passing callback
                     }.bind(this), 1);

              }

       },

       resizeToContent: function(options){

              // Resizes the modalbox window to the actual content height.
              // This might be useful to resize modalbox after some content modifications which were changed ccontent height.

              var byHeight = this.options.height - this.MBwindow.offsetHeight;
              if(byHeight != 0) {
                     if(options) this.setOptions(options); // Passing callbacks
                     Modalbox.resize(0, byHeight);
              }
       },

       resizeToInclude: function(element, options){

              // Resizes the modalbox window to the camulative height of element. Calculations are using CSS properties for margins and border.
              // This method might be useful to resize modalbox before including or updating content.

              var el = $(element);
              var elHeight = el.getHeight() + parseInt(el.getStyle('margin-top')) + parseInt(el.getStyle('margin-bottom')) + parseInt(el.getStyle('border-top-width')) + parseInt(el.getStyle('border-bottom-width'));
              if(elHeight > 0) {
                     if(options) this.setOptions(options); // Passing callbacks
                     Modalbox.resize(0, elHeight);
              }
       },

       _update: function() { // Updating MB in case of wizards
              $(this.MBcontent).update("");
              this.MBcontent.appendChild(this.MBloading);
              $(this.MBloading).update(this.options.loadingString);
              this.currentDims = [this.MBwindow.offsetWidth, this.MBwindow.offsetHeight];
              Modalbox.resize((this.options.width - this.currentDims[0]), (this.options.height - this.currentDims[1]), {_afterResize: this._loadAfterResize.bind(this) });
       },

       loadContent: function () {
              if(this.event("beforeLoad") != false) { // If callback passed false, skip loading of the content
                     if(typeof this.content == 'string') {
                            var htmlRegExp = new RegExp(/<\/?[^>]+>/gi);
                            if(htmlRegExp.test(this.content)) { // Plain HTML given as a parameter
                                   this._insertContent(this.content.stripScripts());
                                   this._putContent(function(){
                                          this.content.extractScripts().map(function(script) {
                                                 return eval(script.replace("<!--", "").replace("// -->", ""));
                                          }.bind(window));
                                   }.bind(this));
                            } else // URL given as a parameter. We'll request it via Ajax
                                   new Ajax.Request( this.content, { method: this.options.method.toLowerCase(), parameters: this.options.params,
                                          onSuccess: function(transport) {
                                                 var response = new String(transport.responseText);
                                                 this._insertContent(transport.responseText.stripScripts());
                                                 this._putContent(function(){
                                                        response.extractScripts().map(function(script) {
                                                               return eval(script.replace("<!--", "").replace("// -->", ""));
                                                        }.bind(window));
                                                 });
                                          }.bind(this),
                                          onException: function(instance, exception){
                                                 Modalbox.hide();
                                                 throw('Modalbox Loading Error: ' + exception);
                                          }
                                   });

                     } else if (typeof this.content == 'object') {// HTML Object is given
                            this._insertContent(this.content);
                            this._putContent();
                     } else {
                            Modalbox.hide();
                            throw('Modalbox Parameters Error: Please specify correct URL or HTML element (plain HTML or object)');
                     }
              }
       },

       _insertContent: function(content){
              $(this.MBcontent).hide().update("");
              if(typeof content == 'string') {
                     setTimeout(function() { // Hack to disable content flickering in Firefox
                            this.MBcontent.update(content);
                     }.bind(this), 1);
              } else if (typeof content == 'object') { // HTML Object is given
                     var _htmlObj = content.cloneNode(true); // If node already a part of DOM we'll clone it
                     // If clonable element has ID attribute defined, modifying it to prevent duplicates
                     if(content.id) content.id = "MB_" + content.id;
                     /* Add prefix for IDs on all elements inside the DOM node */
                     $(content).select('*[id]').each(function(el){ el.id = "MB_" + el.id; });
                     this.MBcontent.appendChild(_htmlObj);
                     this.MBcontent.down().show(); // Toggle visibility for hidden nodes
                     if(Prototype.Browser.IE) // Toggling back visibility for hidden selects in IE
                            $$("#MB_content select").invoke('setStyle', {'visibility': ''});
              }
       },

       _putContent: function(callback){
              // Prepare and resize modal box for content
              if(this.options.height == this._options.height) {
                     setTimeout(function() { // MSIE sometimes doesn't display content correctly
                            Modalbox.resize(0, $(this.MBcontent).getHeight() - $(this.MBwindow).getHeight() + $(this.MBheader).getHeight(), {
                                   afterResize: function(){
                                          this.MBcontent.show().makePositioned();
                                          this.focusableElements = this._findFocusableElements();
                                          this._setFocus(); // Setting focus on first 'focusable' element in content (input, select, textarea, link or button)
                                          setTimeout(function(){ // MSIE fix
                                                 if(callback != undefined)
                                                        callback(); // Executing internal JS from loaded content
                                                 this.event("afterLoad"); // Passing callback
                                          }.bind(this),1);
                                   }.bind(this)
                            });
                     }.bind(this), 1);
              } else { // Height is defined. Creating a scrollable window
                     this._setWidth();
                     this.MBcontent.setStyle({overflow: 'auto', height: $(this.MBwindow).getHeight() - $(this.MBheader).getHeight() - 13 + 'px'});
                     this.MBcontent.show();
                     this.focusableElements = this._findFocusableElements();
                     this._setFocus(); // Setting focus on first 'focusable' element in content (input, select, textarea, link or button)
                     setTimeout(function(){ // MSIE fix
                            if(callback != undefined)
                                   callback(); // Executing internal JS from loaded content
                            this.event("afterLoad"); // Passing callback
                     }.bind(this),1);
              }
       },

       activate: function(options){
              this.setOptions(options);
              this.active = true;
              $(this.MBclose).observe("click", this.hideObserver);
              if(this.options.overlayClose)
                     $(this.MBoverlay).observe("click", this.hideObserver);
              $(this.MBclose).show();
              if(this.options.transitions && this.options.inactiveFade)
                     new Effect.Appear(this.MBwindow, {duration: this.options.slideUpDuration});
       },

       deactivate: function(options) {
              this.setOptions(options);
              this.active = false;
              $(this.MBclose).stopObserving("click", this.hideObserver);
              if(this.options.overlayClose)
                     $(this.MBoverlay).stopObserving("click", this.hideObserver);
              $(this.MBclose).hide();
              if(this.options.transitions && this.options.inactiveFade)
                     new Effect.Fade(this.MBwindow, {duration: this.options.slideUpDuration, to: .75});
       },

       _initObservers: function(){
              $(this.MBclose).observe("click", this.hideObserver);
              if(this.options.overlayClose)
                     $(this.MBoverlay).observe("click", this.hideObserver);
              if(Prototype.Browser.IE)
                     Event.observe(document, "keydown", this.kbdObserver);
              else
                     Event.observe(document, "keypress", this.kbdObserver);
       },

       _removeObservers: function(){
              $(this.MBclose).stopObserving("click", this.hideObserver);
              if(this.options.overlayClose)
                     $(this.MBoverlay).stopObserving("click", this.hideObserver);
              if(Prototype.Browser.IE)
                     Event.stopObserving(document, "keydown", this.kbdObserver);
              else
                     Event.stopObserving(document, "keypress", this.kbdObserver);
       },

       _loadAfterResize: function() {
              this._setWidth();
              this._setPosition();
              this.loadContent();
       },

       _setFocus: function() {
              /* Setting focus to the first 'focusable' element which is one with tabindex = 1 or the first in the form loaded. */
              if(this.focusableElements.length > 0 && this.options.autoFocusing == true) {
                     var firstEl = this.focusableElements.find(function (el){
                            return el.tabIndex == 1;
                     }) || this.focusableElements.first();
                     this.currFocused = this.focusableElements.toArray().indexOf(firstEl);
                     firstEl.focus(); // Focus on first focusable element except close button
              } else if($(this.MBclose).visible())
                     $(this.MBclose).focus(); // If no focusable elements exist focus on close button
       },

       _findFocusableElements: function(){ // Collect form elements or links from MB content
              this.MBcontent.select('input:not([type~=hidden]), select, textarea, button, a[href]').invoke('addClassName', 'MB_focusable');
              return this.MBcontent.select('.MB_focusable');
       },

       _kbdHandler: function(event) {
              var node = event.element();
              switch(event.keyCode) {
                     case Event.KEY_TAB:
                            event.stop();

                            /* Switching currFocused to the element which was focused by mouse instead of TAB-key. Fix for #134 */
                            if(node != this.focusableElements[this.currFocused])
                                   this.currFocused = this.focusableElements.toArray().indexOf(node);

                            if(!event.shiftKey) { //Focusing in direct order
                                   if(this.currFocused == this.focusableElements.length - 1) {
                                          this.focusableElements.first().focus();
                                          this.currFocused = 0;
                                   } else {
                                          this.currFocused++;
                                          this.focusableElements[this.currFocused].focus();
                                   }
                            } else { // Shift key is pressed. Focusing in reverse order
                                   if(this.currFocused == 0) {
                                          this.focusableElements.last().focus();
                                          this.currFocused = this.focusableElements.length - 1;
                                   } else {
                                          this.currFocused--;
                                          this.focusableElements[this.currFocused].focus();
                                   }
                            }
                            break;
                     case Event.KEY_ESC:
                            if(this.active) this._hide(event);
                            break;
                     case 32:
                            this._preventScroll(event);
                            break;
                     case 0: // For Gecko browsers compatibility
                            if(event.which == 32) this._preventScroll(event);
                            break;
                     case Event.KEY_UP:
                     case Event.KEY_DOWN:
                     case Event.KEY_PAGEDOWN:
                     case Event.KEY_PAGEUP:
                     case Event.KEY_HOME:
                     case Event.KEY_END:
                            // Safari operates in slightly different way. This realization is still buggy in Safari.
                            if(Prototype.Browser.WebKit && !["textarea", "select"].include(node.tagName.toLowerCase()))
                                   event.stop();
                            else if( (node.tagName.toLowerCase() == "input" && ["submit", "button"].include(node.type)) || (node.tagName.toLowerCase() == "a") )
                                   event.stop();
                            break;
              }
       },

       _preventScroll: function(event) { // Disabling scrolling by "space" key
              if(!["input", "textarea", "select", "button"].include(event.element().tagName.toLowerCase()))
                     event.stop();
       },

       _deinit: function()
       {
              this._removeObservers();
              Event.stopObserving(window, "resize", this._setWidthAndPosition );
              if(this.options.transitions) {
                     Effect.toggle(this.MBoverlay, 'appear', {duration: this.options.overlayDuration, afterFinish: this._removeElements.bind(this) });
              } else {
                     this.MBoverlay.hide();
                     this._removeElements();
              }
              $(this.MBcontent).setStyle({overflow: '', height: ''});
       },

       _removeElements: function () {
              $(this.MBoverlay).remove();
              $(this.MBwindow).remove();
              if(Prototype.Browser.IE && !navigator.appVersion.match(/\b7.0\b/)) {
                     this._prepareIE("", ""); // If set to auto MSIE will show horizontal scrolling
                     window.scrollTo(this.initScrollX, this.initScrollY);
              }

              /* Replacing prefixes 'MB_' in IDs for the original content */
              if(typeof this.content == 'object') {
                     if(this.content.id && this.content.id.match(/MB_/)) {
                            this.content.id = this.content.id.replace(/MB_/, "");
                     }
                     this.content.select('*[id]').each(function(el){ el.id = el.id.replace(/MB_/, ""); });
              }
              /* Initialized will be set to false */
              this.initialized = false;
              this.event("afterHide"); // Passing afterHide callback
              this.setOptions(this._options); //Settings options object into intial state
       },

       _setWidth: function () { //Set size
              $(this.MBwindow).setStyle({width: this.options.width + "px", height: this.options.height + "px"});
       },

       _setPosition: function () {
              $(this.MBwindow).setStyle({left: Math.round((Element.getWidth(document.body) - Element.getWidth(this.MBwindow)) / 2 ) + "px"});
       },

       _setWidthAndPosition: function () {
              $(this.MBwindow).setStyle({width: this.options.width + "px"});
              this._setPosition();
       },

       _getScrollTop: function () { //From: http://www.quirksmode.org/js/doctypes.html
              var theTop;
              if (document.documentElement && document.documentElement.scrollTop)
                     theTop = document.documentElement.scrollTop;
              else if (document.body)
                     theTop = document.body.scrollTop;
              return theTop;
       },
       _prepareIE: function(height, overflow){
              $$('html, body').invoke('setStyle', {width: height, height: height, overflow: overflow}); // IE requires width and height set to 100% and overflow hidden
              $$("select").invoke('setStyle', {'visibility': overflow}); // Toggle visibility for all selects in the common document
       },
       event: function(eventName) {
              if(this.options[eventName]) {
                     var returnValue = this.options[eventName](); // Executing callback
                     this.options[eventName] = null; // Removing callback after execution
                     if(returnValue != undefined)
                            return returnValue;
                     else
                            return true;
              }
              return true;
       }
};

Object.extend(Modalbox, Modalbox.Methods);

if(Modalbox.overrideAlert) window.alert = Modalbox.alert;

Effect.ScaleBy = Class.create();
Object.extend(Object.extend(Effect.ScaleBy.prototype, Effect.Base.prototype), {
  initialize: function(element, byWidth, byHeight, options) {
    this.element = $(element)
    var options = Object.extend({
         scaleFromTop: true,
      scaleMode: 'box',        // 'box' or 'contents' or {} with provided values
      scaleByWidth: byWidth,
         scaleByHeight: byHeight
    }, arguments[3] || {});
    this.start(options);
  },
  setup: function() {
    this.elementPositioning = this.element.getStyle('position');

    this.originalTop  = this.element.offsetTop;
    this.originalLeft = this.element.offsetLeft;

    this.dims = null;
    if(this.options.scaleMode=='box')
      this.dims = [this.element.offsetHeight, this.element.offsetWidth];
        if(/^content/.test(this.options.scaleMode))
      this.dims = [this.element.scrollHeight, this.element.scrollWidth];
    if(!this.dims)
      this.dims = [this.options.scaleMode.originalHeight,
                   this.options.scaleMode.originalWidth];

       this.deltaY = this.options.scaleByHeight;
       this.deltaX = this.options.scaleByWidth;
  },
  update: function(position) {
    var currentHeight = this.dims[0] + (this.deltaY * position);
       var currentWidth = this.dims[1] + (this.deltaX * position);

       currentHeight = (currentHeight > 0) ? currentHeight : 0;
       currentWidth = (currentWidth > 0) ? currentWidth : 0;

    this.setDimensions(currentHeight, currentWidth);
  },

  setDimensions: function(height, width) {
    var d = {};
    d.width = width + 'px';
    d.height = height + 'px';

       var topd  = Math.round((height - this.dims[0])/2);
       var leftd = Math.round((width  - this.dims[1])/2);
       if(this.elementPositioning == 'absolute' || this.elementPositioning == 'fixed') {
              if(!this.options.scaleFromTop) d.top = this.originalTop-topd + 'px';
              d.left = this.originalLeft-leftd + 'px';
       } else {
              if(!this.options.scaleFromTop) d.top = -topd + 'px';
              d.left = -leftd + 'px';
       }
    this.element.setStyle(d);
  }
});