/*
    This file is part of JonDesign's SmoothGallery v2.0. 3.2.0

    JonDesign's SmoothGallery is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    JonDesign's SmoothGallery is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with JonDesign's SmoothGallery; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Main Developer: Jonathan Schemoul (JonDesign: http://www.jondesign.net/)
    Contributed code by:
    - Christian Ehret (bugfix)
   - Nitrix (bugfix)
   - Valerio from Mad4Milk for his great help with the carousel scrolling and many other things.
   - Archie Cowan for helping me find a bugfix on carousel inner width problem.
   - Tomocchino from #mootools for the preloader class
   Many thanks to:
   - The mootools team for the great mootools lib, and it's help and support throughout the project.
*/

// declaring the class
var gallery = {
   initialize: function(element, options) {
      this.setOptions({
         showArrows: true,
         showCarousel: true,
         showInfopane: true,
         embedLinks: true,
         fadeDuration: 500,
         timed: false,
         delay: 10000,
         preloader: true,
         preloaderImage: true,
         preloaderErrorImage: true,
         /* Data retrieval */
         manualData: [],
         populateFrom: false,
         populateData: true,
         destroyAfterPopulate: true,
         elementSelector: "div.imageElement",
         titleSelector: "h2",
         subtitleSelector: "p",
         linkSelector: "a.open",
         imageSelector: "img.full",
         thumbnailSelector: "img.thumbnail",
         defaultTransition: 'fadeslideleft',
         /* InfoPane options */
         slideInfoZoneOpacity: 0.7,
         slideInfoZoneSlide: true,
         /* Carousel options */
         carouselMinimizedOpacity: 0.4,
         carouselMinimizedHeight: 20,
         carouselMaximizedOpacity: 0.9,
         thumbHeight: 75,
         thumbWidth: 100,
         thumbSpacing: 10,
         thumbIdleOpacity: 0.6,
         textShowCarousel: 'Top News Übersicht',
         showCarouselLabel: true,
         thumbCloseCarousel: true,
         useThumbGenerator: false,
         thumbGenerator: 'resizer.php',
         useExternalCarousel: false,
         carouselElement: false,
         carouselHorizontal: true,
         activateCarouselScroller: true,
         carouselPreloader: true,
         textPreloadingCarousel: 'Loading...',
         /* CSS Classes */
         baseClass: 'jdGallery',
         withArrowsClass: 'withArrows',
         /* Plugins: HistoryManager */
         useHistoryManager: false,
         customHistoryKey: false
      }, options);
      this.fireEvent('onInit');
      this.currentIter = 0;
      this.lastIter = 0;
      this.maxIter = 0;
      this.galleryElement = element;
      this.galleryData = this.options.manualData;
      this.galleryInit = 1;
      this.galleryElements = Array();
      this.thumbnailElements = Array();
      this.galleryElement.addClass(this.options.baseClass);
      
      this.populateFrom = element;
      if (this.options.populateFrom)
         this.populateFrom = this.options.populateFrom;      
      if (this.options.populateData)
         this.populateData();
      element.style.display="block";
      
      if (this.options.useHistoryManager)
         this.initHistory();
      
      if (this.options.embedLinks)
      {
         this.currentLink = new Element('a').addClass('open').setProperties({
            href: '#',
            title: ''
         }).injectInside(element);
         if ((!this.options.showArrows) && (!this.options.showCarousel))
            this.galleryElement = element = this.currentLink;
         else
            this.currentLink.setStyle('display', 'none');
      }
      
      this.constructElements();
      if ((this.galleryData.length>1)&&(this.options.showArrows))
      {
         var leftArrow = new Element('a').addClass('left').addEvent(
            'click',
            this.prevItem.bind(this)
         ).injectInside(element);
         var rightArrow = new Element('a').addClass('right').addEvent(
            'click',
            this.nextItem.bind(this)
         ).injectInside(element);
         this.galleryElement.addClass(this.options.withArrowsClass);
      }
      this.loadingElement = new Element('div').addClass('loadingElement').injectInside(element);
      if (this.options.showInfopane) this.initInfoSlideshow();
      if (this.options.showCarousel) this.initCarousel();
      this.doSlideShow(1);
   },
   populateData: function() {
      currentArrayPlace = this.galleryData.length;
      options = this.options;
      var data = $A(this.galleryData);
      data.extend(this.populateGallery(this.populateFrom, currentArrayPlace));
      this.galleryData = data;
      this.fireEvent('onPopulated');
   },
   populateGallery: function(element, startNumber) {
      var data = [];
      options = this.options;
      currentArrayPlace = startNumber;
      element.getElements(options.elementSelector).each(function(el) {
         elementDict = {
            image: el.getElement(options.imageSelector).getProperty('src'),
            number: currentArrayPlace,
            transition: this.options.defaultTransition
         };
         elementDict.extend = $extend;
         if ((options.showInfopane) | (options.showCarousel))
            elementDict.extend({
               title: el.getElement(options.titleSelector).innerHTML,
               description: el.getElement(options.subtitleSelector).innerHTML
            });
         if (options.embedLinks)
            elementDict.extend({
               link: el.getElement(options.linkSelector).href||false,
               linkTitle: el.getElement(options.linkSelector).title||false,
               linkTarget: el.getElement(options.linkSelector).getProperty('target')||false
            });
         if ((!options.useThumbGenerator) && (options.showCarousel))
            elementDict.extend({
               thumbnail: el.getElement(options.thumbnailSelector).getProperty('src')
            });
         else if (options.useThumbGenerator)
            elementDict.extend({
               thumbnail: options.thumbGenerator + '?imgfile=' + elementDict.image + '&max_width=' + options.thumbWidth + '&max_height=' + options.thumbHeight
            });
         
         data.extend([elementDict]);
         currentArrayPlace++;
         if (this.options.destroyAfterPopulate)
            el.remove();
      });
      return data;
   },
   constructElements: function() {
      el = this.galleryElement;
      this.maxIter = this.galleryData.length;
      var currentImg;
      for(i=0;i<this.galleryData.length;i++)
      {
         var currentImg = new Fx.Styles(
            new Element('div').addClass('slideElement').setStyles({
               'position':'absolute',
               'left':'0px',
               'right':'0px',
               'margin':'0px',
               'padding':'0px',
               'backgroundPosition':"center center",
               'opacity':'0'
            }).injectInside(el),
            'opacity',
            {duration: this.options.fadeDuration}
         );
         if (this.options.preloader)
         {
            currentImg.source = this.galleryData[i].image;
            currentImg.loaded = false;
            currentImg.load = function(imageStyle) {
               if (!imageStyle.loaded)   {
                  new Asset.image(imageStyle.source, {
                                  'onload'  : function(img){
                                       img.element.setStyle(
                                       'backgroundImage',
                                       "url('" + img.source + "')")
                                       img.loaded = true;
                                    }.bind(this, imageStyle)
                  });
               }
            }.pass(currentImg, this);
         } else {
            currentImg.element.setStyle('backgroundImage',
                           "url('" + this.galleryData[i].image + "')");
         }
         this.galleryElements[parseInt(i)] = currentImg;
      }
   },
   destroySlideShow: function(element) {
      var myClassName = element.className;
      var newElement = new Element('div').addClass('myClassName');
      element.parentNode.replaceChild(newElement, element);
   },
   startSlideShow: function() {
      this.fireEvent('onStart');
      this.loadingElement.style.display = "none";
      this.lastIter = this.maxIter - 1;
      this.currentIter = 0;
      this.galleryInit = 0;
      this.galleryElements[parseInt(this.currentIter)].set({opacity: 1});
      if (this.options.showInfopane)
         this.showInfoSlideShow.delay(1000, this);
      var textShowCarousel = formatString(this.options.textShowCarousel, this.currentIter+1, this.maxIter);
      if (this.options.showCarousel&&(!this.options.carouselPreloader))
         this.carouselBtn.setHTML(textShowCarousel).setProperty('title', textShowCarousel);
      this.prepareTimer();
      if (this.options.embedLinks)
         this.makeLink(this.currentIter);
   },
   nextItem: function() {
      this.fireEvent('onNextCalled');
      this.nextIter = this.currentIter+1;
      if (this.nextIter >= this.maxIter)
         this.nextIter = 0;
      this.galleryInit = 0;
      this.goTo(this.nextIter);
   },
   prevItem: function() {
      this.fireEvent('onPreviousCalled');
      this.nextIter = this.currentIter-1;
      if (this.nextIter <= -1)
         this.nextIter = this.maxIter - 1;
      this.galleryInit = 0;
      this.goTo(this.nextIter);
   },
   goTo: function(num) {
      this.clearTimer();
      if(this.options.preloader)
      {
         this.galleryElements[num].load();
         if (num==0)
            this.galleryElements[this.maxIter - 1].load();
         else
            this.galleryElements[num - 1].load();
         if (num==(this.maxIter - 1))
            this.galleryElements[0].load();
         else
            this.galleryElements[num + 1].load();
            
      }
      if (this.options.embedLinks)
         this.clearLink();
      if (this.options.showInfopane)
      {
         this.slideInfoZone.clearChain();
         this.hideInfoSlideShow().chain(this.changeItem.pass(num, this));
      } else
         this.currentChangeDelay = this.changeItem.delay(500, this, num);
      if (this.options.embedLinks)
         this.makeLink(num);
      this.prepareTimer();
      /*if (this.options.showCarousel)
         this.clearThumbnailsHighlights();*/
   },
   changeItem: function(num) {
      this.fireEvent('onStartChanging');
      this.galleryInit = 0;
      if (this.currentIter != num)
      {
         for(i=0;i<this.maxIter;i++)
         {
            if ((i != this.currentIter)) this.galleryElements[i].set({opacity: 0});
         }
         gallery.Transitions[this.galleryData[num].transition].pass([
            this.galleryElements[this.currentIter],
            this.galleryElements[num],
            this.currentIter,
            num], this)();
         this.currentIter = num;
      }
      var textShowCarousel = formatString(this.options.textShowCarousel, num+1, this.maxIter);
      if (this.options.showCarousel)
         this.carouselBtn.setHTML(textShowCarousel).setProperty('title', textShowCarousel);
      this.doSlideShow.bind(this)();
      this.fireEvent('onChanged');
   },
   clearTimer: function() {
      if (this.options.timed)
         $clear(this.timer);
   },
   prepareTimer: function() {
      if (this.options.timed)
         this.timer = this.nextItem.delay(this.options.delay, this);
   },
   doSlideShow: function(position) {
      if (this.galleryInit == 1)
      {
         imgPreloader = new Image();
         imgPreloader.onload=function(){
            this.startSlideShow.delay(10, this);
         }.bind(this);
         imgPreloader.src = this.galleryData[0].image;
         if(this.options.preloader)
            this.galleryElements[0].load();
      } else {
         if (this.options.showInfopane)
         {
            if (this.options.showInfopane)
            {
               this.showInfoSlideShow.delay((500 + this.options.fadeDuration), this);
            } else
               if ((this.options.showCarousel)&&(this.options.activateCarouselScroller))
                  this.centerCarouselOn(position);
         }
      }
   },
   createCarousel: function() {
      var carouselElement;
      if (!this.options.useExternalCarousel)
      {
         var carouselContainerElement = new Element('div').addClass('carouselContainer').injectInside(this.galleryElement);
         this.carouselContainer = new Fx.Styles(carouselContainerElement, {transition: Fx.Transitions.expoOut});
         this.carouselContainer.normalHeight = carouselContainerElement.offsetHeight;
         this.carouselContainer.set({'opacity': this.options.carouselMinimizedOpacity, 'top': (this.options.carouselMinimizedHeight - this.carouselContainer.normalHeight)});
         this.carouselBtn = new Element('a').addClass('carouselBtn').setProperties({
            title: this.options.textShowCarousel
         }).injectInside(carouselContainerElement);
         if(this.options.carouselPreloader)
            this.carouselBtn.setHTML(this.options.textPreloadingCarousel);
         else
            this.carouselBtn.setHTML(this.options.textShowCarousel);
         this.carouselBtn.addEvent(
            'click',
            function () {
               this.carouselContainer.clearTimer();
               this.toggleCarousel();
            }.bind(this)
         );
         this.carouselActive = false;
   
         carouselElement = new Element('div').addClass('carousel').injectInside(carouselContainerElement);
         this.carousel = new Fx.Styles(carouselElement);
      } else {
         carouselElement = $(this.options.carouselElement).addClass('jdExtCarousel');
      }
      this.carouselElement = new Fx.Styles(carouselElement, {transition: Fx.Transitions.expoOut});
      this.carouselElement.normalHeight = carouselElement.offsetHeight;
      if (this.options.showCarouselLabel)
         this.carouselLabel = new Element('p').addClass('label').injectInside(carouselElement);
      carouselWrapper = new Element('div').addClass('carouselWrapper').injectInside(carouselElement);
      this.carouselWrapper = new Fx.Styles(carouselWrapper, {transition: Fx.Transitions.expoOut});
      this.carouselWrapper.normalHeight = carouselWrapper.offsetHeight;
      this.carouselInner = new Element('div').addClass('carouselInner').injectInside(carouselWrapper);
      if (this.options.activateCarouselScroller)
      {
         this.carouselWrapper.scroller = new Scroller(carouselWrapper, {
            area: 100,
            velocity: 0.2
         })
         
         this.carouselWrapper.elementScroller = new Fx.Scroll(carouselWrapper, {
            duration: 400,
            onStart: this.carouselWrapper.scroller.stop.bind(this.carouselWrapper.scroller),
            onComplete: this.carouselWrapper.scroller.start.bind(this.carouselWrapper.scroller)
         });
      }
   },
   fillCarousel: function() {
      this.constructThumbnails();
      this.carouselInner.normalWidth = ((this.maxIter * (this.options.thumbWidth + this.options.thumbSpacing + 2))+this.options.thumbSpacing) + "px";
      this.carouselInner.style.width = this.carouselInner.normalWidth;
   },
   initCarousel: function () {
      this.createCarousel();
      this.fillCarousel();
      if (this.options.carouselPreloader)
         this.preloadThumbnails();
   },
   flushCarousel: function() {
      this.thumbnailElements.each(function(myFx) {
         myFx.element.remove();
         myFx = myFx.element = null;
      });
      this.thumbnailElements = [];
   },
   toggleCarousel: function() {
      if (this.carouselActive)
         this.hideCarousel();
      else
         this.showCarousel();
   },
   showCarousel: function () {
      this.fireEvent('onShowCarousel');
      this.carouselContainer.start({
         'opacity': this.options.carouselMaximizedOpacity,
         'top': 0
      }).chain(function() {
         this.carouselActive = true;
         this.carouselWrapper.scroller.start();
         this.fireEvent('onCarouselShown');
         this.carouselContainer.options.onComplete = null;
      }.bind(this));
   },
   hideCarousel: function () {
      this.fireEvent('onHideCarousel');
      var targetTop = this.options.carouselMinimizedHeight - this.carouselContainer.normalHeight;
      this.carouselContainer.start({
         'opacity': this.options.carouselMinimizedOpacity,
         'top': targetTop
      }).chain(function() {
         this.carouselActive = false;
         this.carouselWrapper.scroller.stop();
         this.fireEvent('onCarouselHidden');
         this.carouselContainer.options.onComplete = null;
      }.bind(this));
   },
   constructThumbnails: function () {
      element = this.carouselInner;
      for(i=0;i<this.galleryData.length;i++)
      {
         var currentImg = new Fx.Style(new Element ('div').addClass("thumbnail").setStyles({
               backgroundImage: "url('" + this.galleryData[i].thumbnail + "')",
               backgroundPosition: "center center",
               backgroundRepeat: 'no-repeat',
               marginLeft: this.options.thumbSpacing + "px",
               width: this.options.thumbWidth + "px",
               height: this.options.thumbHeight + "px"
            }).injectInside(element), "opacity", {duration: 200}).set(this.options.thumbIdleOpacity);
         currentImg.element.addEvents({
            'mouseover': function (myself) {
               myself.clearTimer();
               myself.start(0.99);
               if (this.options.showCarouselLabel)
                  $(this.carouselLabel).setHTML('<span class="number">' + (myself.relatedImage.number + 1) + "/" + this.maxIter + ":</span> " + myself.relatedImage.title);
            }.pass(currentImg, this),
            'mouseout': function (myself) {
               myself.clearTimer();
               myself.start(this.options.thumbIdleOpacity);
            }.pass(currentImg, this),
            'click': function (myself) {
               this.goTo(myself.relatedImage.number);
               if (this.options.thumbCloseCarousel)
                  this.hideCarousel();
            }.pass(currentImg, this)
         });
         
         currentImg.relatedImage = this.galleryData[i];
         this.thumbnailElements[parseInt(i)] = currentImg;
      }
   },
   log: function(value) {
      if(console.log)
         console.log(value);
   },
   preloadThumbnails: function() {
      var thumbnails = [];
      for(i=0;i<this.galleryData.length;i++)
      {
         thumbnails[parseInt(i)] = this.galleryData[i].thumbnail;
      }
      this.thumbnailPreloader = new Preloader();
      this.thumbnailPreloader.addEvent('onComplete', function() {
         var textShowCarousel = formatString(this.options.textShowCarousel, this.currentIter+1, this.maxIter);
         this.carouselBtn.setHTML(textShowCarousel).setProperty('title', textShowCarousel);
      }.bind(this));
      this.thumbnailPreloader.load(thumbnails);
   },
   clearThumbnailsHighlights: function()
   {
      for(i=0;i<this.galleryData.length;i++)
      {
         this.thumbnailElements[i].clearTimer();
         this.thumbnailElements[i].start(0.2);
      }
   },
   changeThumbnailsSize: function(width, height)
   {
      for(i=0;i<this.galleryData.length;i++)
      {
         this.thumbnailElements[i].clearTimer();
         this.thumbnailElements[i].element.setStyles({
            'width': width + "px",
            'height': height + "px"
         });
      }
   },
   centerCarouselOn: function(num) {
      if (!this.carouselWallMode)
      {
         var carouselElement = this.thumbnailElements[num];
         var position = carouselElement.element.offsetLeft + (carouselElement.element.offsetWidth / 2);
         var carouselWidth = this.carouselWrapper.element.offsetWidth;
         var carouselInnerWidth = this.carouselInner.offsetWidth;
         var diffWidth = carouselWidth / 2;
         var scrollPos = position-diffWidth;
         try {
           this.carouselWrapper.elementScroller.scrollTo(scrollPos,0);
         }
         catch(e) {
           this.carouselWrapper.elementScroller.scrollTo = (scrollPos,0);
         }
      }
   },
   initInfoSlideshow: function() {
      /*if (this.slideInfoZone.element)
         this.slideInfoZone.element.remove();*/
      this.slideInfoZone = new Fx.Styles(new Element('div').addClass('slideInfoZone').injectInside($(this.galleryElement))).set({'opacity':0});
      var slideInfoZoneTitle = new Element('h2').injectInside(this.slideInfoZone.element);
      var slideInfoZoneDescription = new Element('p').injectInside(this.slideInfoZone.element);
      this.slideInfoZone.normalHeight = this.slideInfoZone.element.offsetHeight;
      this.slideInfoZone.element.setStyle('opacity',0);
   },
   changeInfoSlideShow: function()
   {
      this.hideInfoSlideShow.delay(10, this);
      this.showInfoSlideShow.delay(500, this);
   },
   showInfoSlideShow: function() {
      this.fireEvent('onShowInfopane');
      this.slideInfoZone.clearTimer();
      element = this.slideInfoZone.element;
      element.getElement('h2').setHTML(this.galleryData[this.currentIter].title);
      element.getElement('p').setHTML(this.galleryData[this.currentIter].description);
      if(this.options.slideInfoZoneSlide)
         this.slideInfoZone.start({'opacity': [0, this.options.slideInfoZoneOpacity], 'height': [0, this.slideInfoZone.normalHeight]});
      else
         this.slideInfoZone.start({'opacity': [0, this.options.slideInfoZoneOpacity]});
      if (this.options.showCarousel)
         this.slideInfoZone.chain(this.centerCarouselOn.pass(this.currentIter, this));
      return this.slideInfoZone;
   },
   hideInfoSlideShow: function() {
      this.fireEvent('onHideInfopane');
      this.slideInfoZone.clearTimer();
      if(this.options.slideInfoZoneSlide)
         this.slideInfoZone.start({'opacity': 0, 'height': 0});
      else
         this.slideInfoZone.start({'opacity': 0});
      return this.slideInfoZone;
   },
   makeLink: function(num) {
      this.currentLink.setProperties({
         href: this.galleryData[num].link,
         title: this.galleryData[num].linkTitle
      })
      if (!((this.options.embedLinks) && (!this.options.showArrows) && (!this.options.showCarousel)))
         this.currentLink.setStyle('display', 'block');
   },
   clearLink: function() {
      this.currentLink.setProperties({href: '', title: ''});
      if (!((this.options.embedLinks) && (!this.options.showArrows) && (!this.options.showCarousel)))
         this.currentLink.setStyle('display', 'none');
   },
   /* To change the gallery data, those two functions : */
   flushGallery: function() {
      this.galleryElements.each(function(myFx) {
         myFx.element.remove();
         myFx = myFx.element = null;
      });
      this.galleryElements = [];
   },
   changeData: function(data) {
      this.galleryData = data;
      this.clearTimer();
      this.flushGallery();
      if (this.options.showCarousel) this.flushCarousel();
      this.constructElements();
      if (this.options.showCarousel) this.fillCarousel();
      if (this.options.showInfopane) this.hideInfoSlideShow();
      this.galleryInit=1;
      this.lastIter=0;
      this.currentIter=0;
      this.doSlideShow(1);
   },
   /* Plugins: HistoryManager */
   initHistory: function() {
      this.fireEvent('onHistoryInit');
      this.historyKey = this.galleryElement.id + '-picture';
      if (this.options.customHistoryKey)
         this.historyKey = this.options.customHistoryKey();
      this.history = HistoryManager.register(
         this.historyKey,
         [1],
         function(values) {
            if (parseInt(values[0])-1 < this.maxIter)
               this.goTo(parseInt(values[0])-1);
         }.bind(this),
         function(values) {
            return [this.historyKey, '(', values[0], ')'].join('');
         }.bind(this),
         this.historyKey + '\\((\\d+)\\)');
      this.addEvent('onChanged', function(){
         this.history.setValue(0, this.currentIter+1);
      }.bind(this));
      this.fireEvent('onHistoryInited');
   }
};
gallery = new Class(gallery);
gallery.implement(new Events);
gallery.implement(new Options);

gallery.Transitions = new Abstract ({
   fade: function(oldFx, newFx, oldPos, newPos){
      oldFx.options.transition = newFx.options.transition = Fx.Transitions.linear;
      oldFx.options.duration = newFx.options.duration = this.options.fadeDuration;
      if (newPos > oldPos) newFx.start({opacity: 1});
      else
      {
         newFx.set({opacity: 1});
         oldFx.start({opacity: 0});
      }
   },
   crossfade: function(oldFx, newFx, oldPos, newPos){
      oldFx.options.transition = newFx.options.transition = Fx.Transitions.linear;
      oldFx.options.duration = newFx.options.duration = this.options.fadeDuration;
      newFx.start({opacity: 1});
      oldFx.start({opacity: 0});
   },
   fadebg: function(oldFx, newFx, oldPos, newPos){
      oldFx.options.transition = newFx.options.transition = Fx.Transitions.linear;
      oldFx.options.duration = newFx.options.duration = this.options.fadeDuration / 2;
      oldFx.start({opacity: 0}).chain(newFx.start.pass([{opacity: 1}], newFx));
   }
});

/* All code copyright 2007 Jonathan Schemoul */

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Follows: Preloader (class)
* Simple class for preloading images with support for progress reporting
* Copyright 2007 Tomocchino.
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

var Preloader = new Class({
  
  Implements: [Events, Options],

  options: {
    root        : '',
    period      : 100
  },
  
  initialize: function(options){
    this.setOptions(options);
  },
  
  load: function(sources) {
    this.index = 0;
    this.images = [];
    this.sources = this.temps = sources;
    this.total = this. sources.length;
    
    this.fireEvent('onStart', [this.index, this.total]);
    this.timer = this.progress.periodical(this.options.period, this);
    
    this.sources.each(function(source, index){
      this.images[index] = new Asset.image(this.options.root + source, {
        'onload'  : function(){ this.index++; if(this.images[index]) this.fireEvent('onLoad', [this.images[index], index, source]); }.bind(this),
        'onerror' : function(){ this.index++; this.fireEvent('onError', [this.images.splice(index, 1), index, source]); }.bind(this),
        'onabort' : function(){ this.index++; this.fireEvent('onError', [this.images.splice(index, 1), index, source]); }.bind(this)
      });
    }, this);
  },
  
  progress: function() {
    this.fireEvent('onProgress', [Math.min(this.index, this.total), this.total]);
    if(this.index >= this.total) this.complete();
  },
  
  complete: function(){
    $clear(this.timer);
    this.fireEvent('onComplete', [this.images]);
  },
  
  cancel: function(){
    $clear(this.timer);
  }
  
});

Preloader.implement(new Events, new Options);

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Follows: formatString (function)
* Original name: Yahoo.Tools.printf
* Copyright Yahoo.
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

function formatString() {
   var num = arguments.length;
   var oStr = arguments[0];
   for (var i = 1; i < num; i++) {
      var pattern = "\\{" + (i-1) + "\\}"; 
      var re = new RegExp(pattern, "g");
      oStr = oStr.replace(re, arguments[i]);
   }
   return oStr; 
}