var Carousel=Class.create();Carousel.prototype={initialize:function(carouselElemID){this.carouselElemID=carouselElemID;this.options=Object.extend({numVisible:4,scrollInc:3,animParameters:{},buttonStateHandler:null,animHandler:null,ajaxHandler:null,initDoneHandler:null,queue:"carousel",size:0,prevElementID:"prev-arrow",nextElementID:"next-arrow",ajaxParameters:null,url:null},arguments[1]||{});this.initDone=false;this.animRunning="none";this.requestIsRunning=false;this.animAfterFinish=this.options.animParameters.afterFinish;Object.extend(this.options.animParameters,{afterFinish:this._animDone.bind(this),queue:{position:'end',scope:this.options.queue}});this.prevScroll=this._prevScroll.bindAsEventListener(this);this.nextScroll=this._nextScroll.bindAsEventListener(this);this.onComplete=this._onComplete.bindAsEventListener(this);this.onFailure=this._onFailure.bindAsEventListener(this);Event.observe(this.options.prevElementID,"click",this.prevScroll);Event.observe(this.options.nextElementID,"click",this.nextScroll);var carouselListClass="carousel-list";this.carouselList=document.getElementsByClassName(carouselListClass,$(carouselElemID))[0]
this.options.size=$(this.carouselList.getElementsByTagName("li")).length;this._init();},destroy:function(){Event.stopObserving(this.options.prevElementID,"click",this.prevScroll);Event.stopObserving(this.options.nextElementID,"click",this.nextScroll);},scrollTo:function(newStart){var old_inc=this.options.scrollInc;this.ignoreNoMoreImages=true;if(newStart>this.currentIndex){this.options.scrollInc=newStart-this.currentIndex;this._nextScroll(this);}else{this.options.scrollInc=this.currentIndex-newStart;this._prevScroll(this);}
this.options.scrollInc=old_inc;},_init:function(){this.currentIndex=0;if(this.options.url)
this._request(this.currentIndex,this.options.numVisible);else{this._getLiElementSize();this._updateButtonStateHandler(this.options.prevElementID,false);this._updateButtonStateHandler(this.options.nextElementID,this.options.size>this.options.numVisible);}},_prevScroll:function(event){if(this.animRunning!="none"||this.currentIndex==0)
return;var inc=this.options.scrollInc;if(this.currentIndex-inc<0)
inc=this.currentIndex;this._scroll(inc)
return false;},_nextScroll:function(event){if(this.animRunning!="none")
return false;if(this.currentIndex+this.options.numVisible+this.options.scrollInc<=this.options.size)
this._scroll(-this.options.scrollInc);else{this.nbInCache=this.options.size-(this.currentIndex+this.options.numVisible);if(this.options.url&&this.noMoreImages==false)
this._request(this.currentIndex+this.options.numVisible+this.nbInCache,this.options.scrollInc-this.nbInCache);else{if(this.nbInCache>0)
this._scroll(-this.nbInCache);}}
return false;},_request:function(start,nb){if(this.options.url&&!this.requestIsRunning){this.requestIsRunning=true;if(this.options.ajaxHandler)
this.options.ajaxHandler(this,"before");var params="start="+start+"&nb="+nb;if(this.options.ajaxParameters!=null)
params+="&"+this.options.ajaxParameters
new Ajax.Request(this.options.url,{parameters:params,onComplete:this.onComplete,onFailure:this.onFailure});}},_onComplete:function(originalRequest){this.requestIsRunning=false;this.carouselList.innerHTML+=originalRequest.responseText;var size=this.options.size;this.options.size=this.carouselList.getElementsByTagName("li").length;var inc=this.options.size-size;if(this.initDone==false){this._getLiElementSize()
this.currentIndex=0;this.initDone=true;if(this.options.initDoneHandler)
this.options.initDoneHandler(this);this._updateButtonStateHandler(this.options.prevElementID,false);this._updateButtonStateHandler(this.options.nextElementID,this.options.size==this.options.numVisible);this.noMoreImages=this.options.size<this.options.numVisible}
else{if(!this.ignoreNoMoreImages)
this.noMoreImages=inc!=this.options.scrollInc;else
this.ignoreNoMoreImages=false;if(inc>0){this._scroll(-inc,this.noMoreImages)}
else{if(this.nbInCache>0)
this._scroll(-this.nbInCache,true);this._updateButtonStateHandler(this.options.nextElementID,false);}}
if(this.options.ajaxHandler)
this.options.ajaxHandler(this,"after");},_onFailure:function(originalRequest){this.requestIsRunning=false;},_animDone:function(event){if(this.options.animHandler)
this.options.animHandler(this.carouselElemID,"after",this.animRunning);this.animRunning="none";if(this.animAfterFinish)
this.animAfterFinish(event);},_updateButtonStateHandler:function(button,state){if(this.options.buttonStateHandler)
this.options.buttonStateHandler(button,state)},_scroll:function(delta,forceDisableNext){this.animRunning=delta>0?"prev":"next";if(this.options.animHandler)
this.options.animHandler(this.carouselElemID,"before",this.animRunning);new Effect.MoveBy(this.carouselList,0,delta*this.elementSize,this.options.animParameters);this.currentIndex-=delta;this._updateButtonStateHandler(this.options.prevElementID,this.currentIndex!=0);if(this.options.url&&this.noMoreImages==false)
enable=true;else
enable=(this.currentIndex+this.options.numVisible<this.options.size);this._updateButtonStateHandler(this.options.nextElementID,(forceDisableNext?false:enable));},_getLiElementSize:function(){var li=$(this.carouselList.getElementsByTagName("li")[0]);this.elementSize=li.getDimensions().width+parseFloat(li.getStyle("margin-left"))+parseFloat(li.getStyle("margin-right"));}}