/**
 * Copyright (c) 2006-2007, Bill W. Scott. All rights reserved.
 * This work is licensed under the Creative Commons Attribution 2.5 License. To view a copy 
 * of this license, visit http://creativecommons.org/licenses/by/2.5/ or send a letter to 
 * Creative Commons, 543 Howard Street, 5th Floor, San Francisco, California, 94105, USA.
 * This work was created by Bill Scott (billwscott.com, looksgoodworkswell.com).
 * The only attribution I require is to keep this notice of copyright & license 
 * in this original source file.
 * Version 0.6.0 - 07.01.2007
 */


YAHOO.namespace("extension");YAHOO.extension.Carousel=function(carouselElementID,carouselCfg){this.init(carouselElementID,carouselCfg);};YAHOO.extension.Carousel.prototype={UNBOUNDED_SIZE:1000000,init:function(carouselElementID,carouselCfg){var oThis=this;this.getCarouselItem=this.getItem;var carouselListClass="carousel-list";var carouselClipRegionClass="carousel-clip-region";var carouselNextClass="carousel-next";var carouselPrevClass="carousel-prev";this._carouselElemID=carouselElementID;this.carouselElem=YAHOO.util.Dom.get(carouselElementID);this._prevEnabled=true;this._nextEnabled=true;this.cfg=new YAHOO.util.Config(this);this.cfg.addProperty("firstItem",{value:1,handler:function(type,args,carouselElem){},validator:oThis.cfg.checkNumber});this.cfg.addProperty("loadOnStart",{value:true,handler:function(type,args,carouselElem){},validator:oThis.cfg.checkBoolean});this.cfg.addProperty("orientation",{value:"horizontal",handler:function(type,args,carouselElem){oThis.reload();},validator:function(orientation){if(typeof orientation=="string"){return("horizontal,vertical".indexOf(orientation.toLowerCase())!=-1);}else{return false;}}});this.cfg.addProperty("size",{value:this.UNBOUNDED_SIZE,handler:function(type,args,carouselElem){oThis.reload();},validator:oThis.cfg.checkNumber});this.cfg.addProperty("numVisible",{value:3,handler:function(type,args,carouselElem){oThis.reload();},validator:oThis.cfg.checkNumber});this.cfg.addProperty("firstVisible",{value:1,handler:function(type,args,carouselElem){oThis.moveTo(args[0]);},validator:oThis.cfg.checkNumber});this.cfg.addProperty("scrollInc",{value:3,handler:function(type,args,carouselElem){},validator:oThis.cfg.checkNumber});this.cfg.addProperty("animationSpeed",{value:0.25,handler:function(type,args,carouselElem){oThis.animationSpeed=args[0];},validator:oThis.cfg.checkNumber});this.cfg.addProperty("animationMethod",{value:YAHOO.util.Easing.easeOut,handler:function(type,args,carouselElem){}});this.cfg.addProperty("animationCompleteHandler",{value:null,handler:function(type,args,carouselElem){if(oThis._animationCompleteEvt){oThis._animationCompleteEvt.unsubscribe(oThis._currAnimationCompleteHandler,oThis);}
oThis._currAnimationCompleteHandler=args[0];if(oThis._currAnimationCompleteHandler){if(!oThis._animationCompleteEvt){oThis._animationCompleteEvt=new YAHOO.util.CustomEvent("onAnimationComplete",oThis);}
oThis._animationCompleteEvt.subscribe(oThis._currAnimationCompleteHandler,oThis);}}});this.cfg.addProperty("autoPlay",{value:0,handler:function(type,args,carouselElem){var autoPlay=args[0];if(autoPlay>0)
oThis.startAutoPlay();else
oThis.stopAutoPlay();}});this.cfg.addProperty("wrap",{value:false,handler:function(type,args,carouselElem){},validator:oThis.cfg.checkBoolean});this.cfg.addProperty("navMargin",{value:0,handler:function(type,args,carouselElem){oThis.calculateSize();},validator:oThis.cfg.checkNumber});this.cfg.addProperty("revealAmount",{value:0,handler:function(type,args,carouselElem){oThis.reload();},validator:oThis.cfg.checkNumber});this.cfg.addProperty("prevElementID",{value:null,handler:function(type,args,carouselElem){if(oThis._carouselPrev){YAHOO.util.Event.removeListener(oThis._carouselPrev,"click",oThis._scrollPrev);}
oThis._prevElementID=args[0];if(oThis._prevElementID==null){oThis._carouselPrev=YAHOO.util.Dom.getElementsByClassName(carouselPrevClass,"div",oThis.carouselElem)[0];}else{oThis._carouselPrev=YAHOO.util.Dom.get(oThis._prevElementID);}
YAHOO.util.Event.addListener(oThis._carouselPrev,"click",oThis._scrollPrev,oThis);}});this.cfg.addProperty("prevElement",{value:null,handler:function(type,args,carouselElem){if(oThis._carouselPrev){YAHOO.util.Event.removeListener(oThis._carouselPrev,"click",oThis._scrollPrev);}
oThis._prevElementID=args[0];if(oThis._prevElementID==null){oThis._carouselPrev=YAHOO.util.Dom.getElementsByClassName(carouselPrevClass,"div",oThis.carouselElem)[0];}else{oThis._carouselPrev=YAHOO.util.Dom.get(oThis._prevElementID);}
YAHOO.util.Event.addListener(oThis._carouselPrev,"click",oThis._scrollPrev,oThis);}});this.cfg.addProperty("nextElementID",{value:null,handler:function(type,args,carouselElem){if(oThis._carouselNext){YAHOO.util.Event.removeListener(oThis._carouselNext,"click",oThis._scrollNext);}
oThis._nextElementID=args[0];if(oThis._nextElementID==null){oThis._carouselNext=YAHOO.util.Dom.getElementsByClassName(carouselNextClass,"div",oThis.carouselElem);}else{oThis._carouselNext=YAHOO.util.Dom.get(oThis._nextElementID);}
if(oThis._carouselNext){YAHOO.util.Event.addListener(oThis._carouselNext,"click",oThis._scrollNext,oThis);}}});this.cfg.addProperty("nextElement",{value:null,handler:function(type,args,carouselElem){if(oThis._carouselNext){YAHOO.util.Event.removeListener(oThis._carouselNext,"click",oThis._scrollNext);}
oThis._nextElementID=args[0];if(oThis._nextElementID==null){oThis._carouselNext=YAHOO.util.Dom.getElementsByClassName(carouselNextClass,"div",oThis.carouselElem);}else{oThis._carouselNext=YAHOO.util.Dom.get(oThis._nextElementID);}
if(oThis._carouselNext){YAHOO.util.Event.addListener(oThis._carouselNext,"click",oThis._scrollNext,oThis);}}});this.cfg.addProperty("loadInitHandler",{value:null,handler:function(type,args,carouselElem){if(oThis._loadInitHandlerEvt){oThis._loadInitHandlerEvt.unsubscribe(oThis._currLoadInitHandler,oThis);}
oThis._currLoadInitHandler=args[0];if(oThis._currLoadInitHandler){if(!oThis._loadInitHandlerEvt){oThis._loadInitHandlerEvt=new YAHOO.util.CustomEvent("onLoadInit",oThis);}
oThis._loadInitHandlerEvt.subscribe(oThis._currLoadInitHandler,oThis);}}});this.cfg.addProperty("loadNextHandler",{value:null,handler:function(type,args,carouselElem){if(oThis._loadNextHandlerEvt){oThis._loadNextHandlerEvt.unsubscribe(oThis._currLoadNextHandler,oThis);}
oThis._currLoadNextHandler=args[0];if(oThis._currLoadNextHandler){if(!oThis._loadNextHandlerEvt){oThis._loadNextHandlerEvt=new YAHOO.util.CustomEvent("onLoadNext",oThis);}
oThis._loadNextHandlerEvt.subscribe(oThis._currLoadNextHandler,oThis);}}});this.cfg.addProperty("loadPrevHandler",{value:null,handler:function(type,args,carouselElem){if(oThis._loadPrevHandlerEvt){oThis._loadPrevHandlerEvt.unsubscribe(oThis._currLoadPrevHandler,oThis);}
oThis._currLoadPrevHandler=args[0];if(oThis._currLoadPrevHandler){if(!oThis._loadPrevHandlerEvt){oThis._loadPrevHandlerEvt=new YAHOO.util.CustomEvent("onLoadPrev",oThis);}
oThis._loadPrevHandlerEvt.subscribe(oThis._currLoadPrevHandler,oThis);}}});this.cfg.addProperty("prevButtonStateHandler",{value:null,handler:function(type,args,carouselElem){if(oThis._currPrevButtonStateHandler){oThis._prevButtonStateHandlerEvt.unsubscribe(oThis._currPrevButtonStateHandler,oThis);}
oThis._currPrevButtonStateHandler=args[0];if(oThis._currPrevButtonStateHandler){if(!oThis._prevButtonStateHandlerEvt){oThis._prevButtonStateHandlerEvt=new YAHOO.util.CustomEvent("onPrevButtonStateChange",oThis);}
oThis._prevButtonStateHandlerEvt.subscribe(oThis._currPrevButtonStateHandler,oThis);}}});this.cfg.addProperty("nextButtonStateHandler",{value:null,handler:function(type,args,carouselElem){if(oThis._currNextButtonStateHandler){oThis._nextButtonStateHandlerEvt.unsubscribe(oThis._currNextButtonStateHandler,oThis);}
oThis._currNextButtonStateHandler=args[0];if(oThis._currNextButtonStateHandler){if(!oThis._nextButtonStateHandlerEvt){oThis._nextButtonStateHandlerEvt=new YAHOO.util.CustomEvent("onNextButtonStateChange",oThis);}
oThis._nextButtonStateHandlerEvt.subscribe(oThis._currNextButtonStateHandler,oThis);}}});if(carouselCfg){this.cfg.applyConfig(carouselCfg);}
this._origFirstVisible=this.cfg.getProperty("firstVisible");this._currLoadInitHandler=this.cfg.getProperty("loadInitHandler");this._currLoadNextHandler=this.cfg.getProperty("loadNextHandler");this._currLoadPrevHandler=this.cfg.getProperty("loadPrevHandler");this._currPrevButtonStateHandler=this.cfg.getProperty("prevButtonStateHandler");this._currNextButtonStateHandler=this.cfg.getProperty("nextButtonStateHandler");this._currAnimationCompleteHandler=this.cfg.getProperty("animationCompleteHandler");this._nextElementID=this.cfg.getProperty("nextElementID");if(!this._nextElementID)
this._nextElementID=this.cfg.getProperty("nextElement");this._prevElementID=this.cfg.getProperty("prevElementID");if(!this._prevElementID)
this._prevElementID=this.cfg.getProperty("prevElement");this._autoPlayTimer=null;this._priorLastVisible=this._priorFirstVisible=this.cfg.getProperty("firstVisible");this._lastPrebuiltIdx=0;this.carouselList=YAHOO.util.Dom.getElementsByClassName(carouselListClass,"ul",this.carouselElem)[0];if(this._nextElementID==null){this._carouselNext=YAHOO.util.Dom.getElementsByClassName(carouselNextClass,"div",this.carouselElem)[0];}else{this._carouselNext=YAHOO.util.Dom.get(this._nextElementID);}
if(this._prevElementID==null){this._carouselPrev=YAHOO.util.Dom.getElementsByClassName(carouselPrevClass,"div",this.carouselElem)[0];}else{this._carouselPrev=YAHOO.util.Dom.get(this._prevElementID);}
this._clipReg=YAHOO.util.Dom.getElementsByClassName(carouselClipRegionClass,"div",this.carouselElem)[0];if(this.isVertical()){YAHOO.util.Dom.addClass(this.carouselList,"carousel-vertical");}
this._scrollNextAnim=new YAHOO.util.Motion(this.carouselList,this.scrollNextParams,this.cfg.getProperty("animationSpeed"),this.cfg.getProperty("animationMethod"));this._scrollPrevAnim=new YAHOO.util.Motion(this.carouselList,this.scrollPrevParams,this.cfg.getProperty("animationSpeed"),this.cfg.getProperty("animationMethod"));if(this._carouselNext){YAHOO.util.Event.addListener(this._carouselNext,"click",this._scrollNext,this);}
if(this._carouselPrev){YAHOO.util.Event.addListener(this._carouselPrev,"click",this._scrollPrev,this);}
var loadInitHandler=this.cfg.getProperty("loadInitHandler");if(loadInitHandler){this._loadInitHandlerEvt=new YAHOO.util.CustomEvent("onLoadInit",this);this._loadInitHandlerEvt.subscribe(loadInitHandler,this);}
var loadNextHandler=this.cfg.getProperty("loadNextHandler");if(loadNextHandler){this._loadNextHandlerEvt=new YAHOO.util.CustomEvent("onLoadNext",this);this._loadNextHandlerEvt.subscribe(loadNextHandler,this);}
var loadPrevHandler=this.cfg.getProperty("loadPrevHandler");if(loadPrevHandler){this._loadPrevHandlerEvt=new YAHOO.util.CustomEvent("onLoadPrev",this);this._loadPrevHandlerEvt.subscribe(loadPrevHandler,this);}
var animationCompleteHandler=this.cfg.getProperty("animationCompleteHandler");if(animationCompleteHandler){this._animationCompleteEvt=new YAHOO.util.CustomEvent("onAnimationComplete",this);this._animationCompleteEvt.subscribe(animationCompleteHandler,this);}
var prevButtonStateHandler=this.cfg.getProperty("prevButtonStateHandler");if(prevButtonStateHandler){this._prevButtonStateHandlerEvt=new YAHOO.util.CustomEvent("onPrevButtonStateChange",this);this._prevButtonStateHandlerEvt.subscribe(prevButtonStateHandler,this);}
var nextButtonStateHandler=this.cfg.getProperty("nextButtonStateHandler");if(nextButtonStateHandler){this._nextButtonStateHandlerEvt=new YAHOO.util.CustomEvent("onNextButtonStateChange",this);this._nextButtonStateHandlerEvt.subscribe(nextButtonStateHandler,this);}
YAHOO.util.Event.onAvailable(this._carouselElemID+"-item-"+this.cfg.getProperty("firstVisible"),this._calculateSize,this);if(this.cfg.getProperty("loadOnStart"))
this._loadInitial();},clear:function(){var loadInitHandler=this.cfg.getProperty("loadInitHandler");if(loadInitHandler){this._removeChildrenFromNode(this.carouselList);this._lastPrebuiltIdx=0;}
this.stopAutoPlay();var firstVisible=this.cfg.getProperty("firstVisible");this._priorLastVisible=this._priorFirstVisible=firstVisible;this.moveTo(this.cfg.getProperty("firstVisible"));},reload:function(numVisible){if(this._isValidObj(numVisible)){this.cfg.setProperty("numVisible",numVisible);}
this.clear();YAHOO.util.Event.onAvailable(this._carouselElemID+"-item-"+this.cfg.getProperty("firstVisible"),this._calculateSize,this);this._loadInitial();},load:function(){YAHOO.util.Event.onAvailable(this._carouselElemID+"-item-"+this.cfg.getProperty("firstVisible"),this._calculateSize,this);this._loadInitial();},addItem:function(idx,innerHTMLOrElem,itemClass){if(idx>this.cfg.getProperty("size")){return null;}
var liElem=this.getItem(idx);if(!this._isValidObj(liElem)){liElem=this._createItem(idx,innerHTMLOrElem);this.carouselList.appendChild(liElem);}else if(this._isValidObj(liElem.placeholder)){var newLiElem=this._createItem(idx,innerHTMLOrElem);this.carouselList.replaceChild(newLiElem,liElem);liElem=newLiElem;}
if(this._isValidObj(itemClass)){YAHOO.util.Dom.addClass(liElem,itemClass);}
if(this.isVertical())
setTimeout(function(){liElem.style.display="block";},1);return liElem;},insertBefore:function(refIdx,innerHTML){if(refIdx>(this.cfg.getProperty("size")+1)){return null;}
var firstItem=this.cfg.getProperty("firstItem");if(refIdx<firstItem){refIdx=firstItem;}
var insertionIdx=refIdx-1;if(insertionIdx>this._lastPrebuiltIdx){this._prebuildItems(this._lastPrebuiltIdx,refIdx);}
var liElem=this._insertBeforeItem(refIdx,innerHTML);if(this.cfg.getProperty("firstVisible")>insertionIdx||this._priorLastVisible<this.cfg.getProperty("size")){if(this._nextEnabled===false){this._enableNext();}}
return liElem;},insertAfter:function(refIdx,innerHTML){if(refIdx>this.cfg.getProperty("size")){refIdx=this.cfg.getProperty("size");}
var insertionIdx=refIdx+1;if(insertionIdx>this._lastPrebuiltIdx){this._prebuildItems(this._lastPrebuiltIdx,insertionIdx+1);}
var liElem=this._insertAfterItem(refIdx,innerHTML);if(insertionIdx>this.cfg.getProperty("size")){this.cfg.setProperty("size",insertionIdx,true);if(this._nextEnabled===false){this._enableNext();}}
if(this.cfg.getProperty("firstVisible")>insertionIdx||this._priorLastVisible<this.cfg.getProperty("size")){if(this._nextEnabled===false){this._enableNext();}}
return liElem;},scrollNext:function(){this._scrollNext(null,this);this._autoPlayTimer=null;if(this.cfg.getProperty("autoPlay")!==0){this._autoPlayTimer=this.startAutoPlay();}},scrollPrev:function(){this._scrollPrev(null,this);},scrollTo:function(newStart){this._position(newStart,true);},moveTo:function(newStart){this._position(newStart,false);},startAutoPlay:function(interval){if(this._isValidObj(interval)){this.cfg.setProperty("autoPlay",interval,true);}
if(this._autoPlayTimer!==null){return this._autoPlayTimer;}
var oThis=this;var autoScroll=function(){oThis.scrollNext();};this._autoPlayTimer=setTimeout(autoScroll,this.cfg.getProperty("autoPlay"));return this._autoPlayTimer;},stopAutoPlay:function(){if(this._autoPlayTimer!==null){clearTimeout(this._autoPlayTimer);this._autoPlayTimer=null;}},isVertical:function(){return(this.cfg.getProperty("orientation")!="horizontal");},isItemLoaded:function(idx){var liElem=this.getItem(idx);if(this._isValidObj(liElem)&&!this._isValidObj(liElem.placeholder)){return true;}
return false;},getItem:function(idx){var elemName=this._carouselElemID+"-item-"+idx;var liElem=YAHOO.util.Dom.get(elemName);return liElem;},show:function(){YAHOO.util.Dom.setStyle(this.carouselElem,"display","block");this.calculateSize();},hide:function(){YAHOO.util.Dom.setStyle(this.carouselElem,"display","none");},calculateSize:function(){var ulKids=this.carouselList.childNodes;var li=null;for(var i=0;i<ulKids.length;i++){li=ulKids[i];if(li.tagName=="LI"||li.tagName=="li"){break;}}
var navMargin=this.cfg.getProperty("navMargin");var numVisible=this.cfg.getProperty("numVisible");var firstVisible=this.cfg.getProperty("firstVisible");var pl=this._getStyleVal(li,"paddingLeft");var pr=this._getStyleVal(li,"paddingRight");var ml=this._getStyleVal(li,"marginLeft");var mr=this._getStyleVal(li,"marginRight");var pt=this._getStyleVal(li,"paddingTop");var pb=this._getStyleVal(li,"paddingBottom");var mt=this._getStyleVal(li,"marginTop");var mb=this._getStyleVal(li,"marginBottom");YAHOO.util.Dom.removeClass(this.carouselList,"carousel-vertical");YAHOO.util.Dom.removeClass(this.carouselList,"carousel-horizontal");if(this.isVertical()){var liPaddingMarginWidth=pl+pr+ml+mr;YAHOO.util.Dom.addClass(this.carouselList,"carousel-vertical");var liPaddingMarginHeight=pt+pb+mt+mb;var upt=this._getStyleVal(this.carouselList,"paddingTop");var upb=this._getStyleVal(this.carouselList,"paddingBottom");var umt=this._getStyleVal(this.carouselList,"marginTop")
var umb=this._getStyleVal(this.carouselList,"marginBottom")
var ulPaddingHeight=upt+upb+umt+umb;var revealAmt=(this.cfg.getProperty("revealAmount")>0)?(this.cfg.getProperty("revealAmount")+(liPaddingMarginHeight)/2):0;var liHeight=this._getStyleVal(li,"height",true);this.scrollAmountPerInc=(liHeight+liPaddingMarginHeight);var liWidth=this._getStyleVal(li,"width");this.carouselElem.style.width=(liWidth+liPaddingMarginWidth)+"px";this._clipReg.style.height=(this.scrollAmountPerInc*numVisible+revealAmt*2+
ulPaddingHeight)+"px";this.carouselElem.style.height=(this.scrollAmountPerInc*numVisible+revealAmt*2+navMargin*2+
ulPaddingHeight)+"px";var revealTop=(this.cfg.getProperty("revealAmount")>0)?(revealAmt-(Math.abs(mt-mb)+Math.abs(pt-pb))/2):0;YAHOO.util.Dom.setStyle(this.carouselList,"position","relative");YAHOO.util.Dom.setStyle(this.carouselList,"top",""+revealTop+"px");var currY=YAHOO.util.Dom.getY(this.carouselList);YAHOO.util.Dom.setY(this.carouselList,currY-this.scrollAmountPerInc*(firstVisible-1));}else{YAHOO.util.Dom.addClass(this.carouselList,"carousel-horizontal");var upl=this._getStyleVal(this.carouselList,"paddingLeft");var upr=this._getStyleVal(this.carouselList,"paddingRight");var uml=this._getStyleVal(this.carouselList,"marginLeft")
var umr=this._getStyleVal(this.carouselList,"marginRight")
var ulPaddingWidth=upl+upr+uml+umr;var liMarginWidth=ml+mr;var liPaddingMarginWidth=liMarginWidth+pr+pl;var revealAmt=(this.cfg.getProperty("revealAmount")>0)?(this.cfg.getProperty("revealAmount")+(liPaddingMarginWidth)/2):0;var liWidth=li.offsetWidth;this.scrollAmountPerInc=liWidth+liMarginWidth;this._clipReg.style.width=(this.scrollAmountPerInc*numVisible+revealAmt*2)+"px";this.carouselElem.style.width=(this.scrollAmountPerInc*numVisible+navMargin*2+revealAmt*2+
ulPaddingWidth)+"px";var revealLeft=(this.cfg.getProperty("revealAmount")>0)?(revealAmt-(Math.abs(mr-ml)+Math.abs(pr-pl))/2-(uml+upl)):0;YAHOO.util.Dom.setStyle(this.carouselList,"position","relative");YAHOO.util.Dom.setStyle(this.carouselList,"left",""+revealLeft+"px");var currX=YAHOO.util.Dom.getX(this.carouselList);YAHOO.util.Dom.setX(this.carouselList,currX-this.scrollAmountPerInc*(firstVisible-1));}},setProperty:function(property,value,silent){this.cfg.setProperty(property,value,silent);},getProperty:function(property){return this.cfg.getProperty(property);},getFirstItemRevealed:function(){return this._firstItemRevealed;},getLastItemRevealed:function(){return this._lastItemRevealed;},getLastVisible:function(){var firstVisible=this.cfg.getProperty("firstVisible");var numVisible=this.cfg.getProperty("numVisible");return firstVisible+numVisible-1;},_getStyleVal:function(li,style,returnFloat){var styleValStr=YAHOO.util.Dom.getStyle(li,style);var styleVal=returnFloat?parseFloat(styleValStr):parseInt(styleValStr,10);if(style=="height"&&isNaN(styleVal)){styleVal=li.offsetHeight;}else if(isNaN(styleVal)){styleVal=0;}
return styleVal;},_calculateSize:function(me){me.calculateSize();me.show();},_removeChildrenFromNode:function(node)
{if(!this._isValidObj(node))
{return;}
var len=node.childNodes.length;while(node.hasChildNodes())
{node.removeChild(node.firstChild);}},_prebuildLiElem:function(idx){if(idx<1)return;var liElem=document.createElement("li");liElem.id=this._carouselElemID+"-item-"+idx;liElem.placeholder=true;this.carouselList.appendChild(liElem);this._lastPrebuiltIdx=(idx>this._lastPrebuiltIdx)?idx:this._lastPrebuiltIdx;},_createItem:function(idx,innerHTMLOrElem){if(idx<1)return;var liElem=document.createElement("li");liElem.id=this._carouselElemID+"-item-"+idx;if(typeof(innerHTMLOrElem)==="string"){liElem.innerHTML=innerHTMLOrElem;}else{liElem.appendChild(innerHTMLOrElem);}
return liElem;},_insertAfterItem:function(refIdx,innerHTMLOrElem){return this._insertBeforeItem(refIdx+1,innerHTMLOrElem);},_insertBeforeItem:function(refIdx,innerHTMLOrElem){var refItem=this.getItem(refIdx);var size=this.cfg.getProperty("size");if(size!=this.UNBOUNDED_SIZE){this.cfg.setProperty("size",size+1,true);}
for(var i=this._lastPrebuiltIdx;i>=refIdx;i--){var anItem=this.getItem(i);if(this._isValidObj(anItem)){anItem.id=this._carouselElemID+"-item-"+(i+1);}}
var liElem=this._createItem(refIdx,innerHTMLOrElem);var insertedItem=this.carouselList.insertBefore(liElem,refItem);this._lastPrebuiltIdx+=1;return liElem;},insertAfterEnd:function(innerHTMLOrElem){return this.insertAfter(this.cfg.getProperty("size"),innerHTMLOrElem);},_position:function(newStart,showAnimation){var currStart=this._priorFirstVisible;if(newStart>currStart){var inc=newStart-currStart;this._scrollNextInc(this,inc,showAnimation);}else{var dec=currStart-newStart;this._scrollPrevInc(this,dec,showAnimation);}},_scrollPrev:function(e,carousel){if(e!==null){carousel.stopAutoPlay();}
if(carousel._scrollPrevAnim.isAnimated()){return false;}
carousel._scrollPrevInc(carousel,carousel.cfg.getProperty("scrollInc"),(carousel.cfg.getProperty("animationSpeed")!==0));},_scrollNext:function(e,carousel){if(e!==null){carousel.stopAutoPlay();}
if(carousel._scrollNextAnim.isAnimated()){return false;}
carousel._scrollNextInc(carousel,carousel.cfg.getProperty("scrollInc"),(carousel.cfg.getProperty("animationSpeed")!==0));},_handleAnimationComplete:function(type,args,argList){var carousel=argList[0];var direction=argList[1];carousel._animationCompleteEvt.fire(direction);},_areAllItemsLoaded:function(first,last){var itemsLoaded=true;for(var i=first;i<=last;i++){var liElem=this.getItem(i);if(!this._isValidObj(liElem)){this._prebuildLiElem(i);itemsLoaded=false;}else if(this._isValidObj(liElem.placeholder)){itemsLoaded=false;}}
return itemsLoaded;},_prebuildItems:function(first,last){for(var i=first;i<=last;i++){var liElem=this.getItem(i);if(!this._isValidObj(liElem)){this._prebuildLiElem(i);}}},_scrollNextInc:function(carousel,inc,showAnimation){var numVisible=carousel.cfg.getProperty("numVisible");var currStart=carousel.cfg.getProperty("firstVisible");var currEnd=currStart+numVisible-1;var size=carousel.cfg.getProperty("size");if(carousel.cfg.getProperty("wrap")&&currEnd==size){carousel.scrollTo(carousel.cfg.getProperty("firstItem"));return;}
var newStart=currStart+inc;var newEnd=newStart+numVisible-1;if(newEnd>size){newEnd=size;newStart=newEnd-numVisible+1;}
inc=newStart-currStart;carousel.cfg.setProperty("firstVisible",newStart,true);if((carousel._prevEnabled===false)&&(newStart>carousel.cfg.getProperty("firstItem"))){carousel._enablePrev();}
if((carousel._nextEnabled===true)&&(newEnd==size)){carousel._disableNext();}
if(inc>0){if(carousel._isValidObj(carousel.cfg.getProperty("loadNextHandler"))){var alreadyCached=carousel._areAllItemsLoaded(currEnd+1,newEnd);var extraToReveal=(this.cfg.getProperty("revealAmount")>0&&newEnd<size)?1:0;this._calculateItemsRevealed();carousel._loadNextHandlerEvt.fire(currEnd+1,newEnd+extraToReveal,alreadyCached);}
if(showAnimation){var nextParams={points:{by:[-carousel.scrollAmountPerInc*inc,0]}};if(carousel.isVertical()){nextParams={points:{by:[0,-carousel.scrollAmountPerInc*inc]}};}
carousel._scrollNextAnim=new YAHOO.util.Motion(carousel.carouselList,nextParams,carousel.cfg.getProperty("animationSpeed"),carousel.cfg.getProperty("animationMethod"));if(carousel.cfg.getProperty("animationCompleteHandler")){carousel._scrollNextAnim.onComplete.subscribe(this._handleAnimationComplete,[carousel,"next"]);}
carousel._scrollNextAnim.animate();}else{if(carousel.isVertical()){var currY=YAHOO.util.Dom.getY(carousel.carouselList);YAHOO.util.Dom.setY(carousel.carouselList,currY-carousel.scrollAmountPerInc*inc);}else{var currX=YAHOO.util.Dom.getX(carousel.carouselList);YAHOO.util.Dom.setX(carousel.carouselList,currX-carousel.scrollAmountPerInc*inc);}}}
carousel._priorFirstVisible=newStart;carousel._priorLastVisible=newEnd;return false;},_scrollPrevInc:function(carousel,dec,showAnimation){var numVisible=carousel.cfg.getProperty("numVisible");var currStart=carousel.cfg.getProperty("firstVisible");var currEnd=carousel._priorLastVisible;var size=carousel.cfg.getProperty("size");var newStart=currStart-dec;var firstItem=carousel.cfg.getProperty("firstItem");newStart=(newStart<=firstItem)?firstItem:newStart;var newEnd=newStart+numVisible-1;if(newEnd>size){newEnd=size;newStart=newEnd-numVisible+1;}
dec=currStart-newStart;carousel.cfg.setProperty("firstVisible",newStart,true);if((carousel._prevEnabled===true)&&(newStart==firstItem)){carousel._disablePrev();}
if((carousel._nextEnabled===false)&&(newEnd<size)){carousel._enableNext();}
if(dec>0){if(carousel._isValidObj(carousel.cfg.getProperty("loadPrevHandler"))){var alreadyCached=carousel._areAllItemsLoaded(newStart,currStart-1);var extraToReveal=(this.cfg.getProperty("revealAmount")>0)?1:0;var firstToLoad=((newStart-extraToReveal)<1)?1:newStart-extraToReveal;this._calculateItemsRevealed();carousel._loadPrevHandlerEvt.fire(firstToLoad,currStart-1,alreadyCached);}
if(showAnimation){var prevParams={points:{by:[carousel.scrollAmountPerInc*dec,0]}};if(carousel.isVertical()){prevParams={points:{by:[0,carousel.scrollAmountPerInc*dec]}};}
carousel._scrollPrevAnim=new YAHOO.util.Motion(carousel.carouselList,prevParams,carousel.cfg.getProperty("animationSpeed"),carousel.cfg.getProperty("animationMethod"));if(carousel.cfg.getProperty("animationCompleteHandler")){carousel._scrollPrevAnim.onComplete.subscribe(this._handleAnimationComplete,[carousel,"prev"]);}
carousel._scrollPrevAnim.animate();}else{if(carousel.isVertical()){var currY=YAHOO.util.Dom.getY(carousel.carouselList);YAHOO.util.Dom.setY(carousel.carouselList,currY+
carousel.scrollAmountPerInc*dec);}else{var currX=YAHOO.util.Dom.getX(carousel.carouselList);YAHOO.util.Dom.setX(carousel.carouselList,currX+
carousel.scrollAmountPerInc*dec);}}}
carousel._priorFirstVisible=newStart;carousel._priorLastVisible=newEnd;return false;},_loadInitial:function(){var numVisible=this.cfg.getProperty("numVisible");var firstVisible=this.cfg.getProperty("firstVisible");var firstItem=this.cfg.getProperty("firstItem");this._priorLastVisible=firstVisible+numVisible-1;if(firstVisible==firstItem){this._disablePrev();}
if(this._priorLastVisible==this.cfg.getProperty("size")){this._disableNext();}
if(this._loadInitHandlerEvt){var alreadyCached=this._areAllItemsLoaded(1,this._priorLastVisible);var revealOffset=(this.cfg.getProperty("revealAmount")>0)?1:0;this._calculateItemsRevealed();var first=(firstVisible>1)?firstVisible-revealOffset:firstVisible;var last=this._priorLastVisible+revealOffset;this._loadInitHandlerEvt.fire(first,last,alreadyCached);}
if(this.cfg.getProperty("autoPlay")!==0){this._autoPlayTimer=this.startAutoPlay();}},_calculateItemsRevealed:function(){var extraToReveal=(this.cfg.getProperty("revealAmount")>0);var firstVisible=this.cfg.getProperty("firstVisible");var lastVisible=this.getLastVisible();var size=this.cfg.getProperty("size");this._firstItemRevealed=-1;this._lastItemRevealed=-1;if(extraToReveal){if(firstVisible>1)this._firstItemRevealed=firstVisible-1;if(lastVisible<size)this._lastItemRevealed=lastVisible+1;}},_disablePrev:function(){this._prevEnabled=false;if(this._prevButtonStateHandlerEvt){this._prevButtonStateHandlerEvt.fire(false,this._carouselPrev);}
if(this._isValidObj(this._carouselPrev)){YAHOO.util.Event.removeListener(this._carouselPrev,"click",this._scrollPrev);}},_enablePrev:function(){this._prevEnabled=true;if(this._prevButtonStateHandlerEvt){this._prevButtonStateHandlerEvt.fire(true,this._carouselPrev);}
if(this._isValidObj(this._carouselPrev)){YAHOO.util.Event.addListener(this._carouselPrev,"click",this._scrollPrev,this);}},_disableNext:function(){if(this.cfg.getProperty("wrap")){return;}
this._nextEnabled=false;if(this._isValidObj(this._nextButtonStateHandlerEvt)){this._nextButtonStateHandlerEvt.fire(false,this._carouselNext);}
if(this._isValidObj(this._carouselNext)){YAHOO.util.Event.removeListener(this._carouselNext,"click",this._scrollNext);}},_enableNext:function(){this._nextEnabled=true;if(this._isValidObj(this._nextButtonStateHandlerEvt)){this._nextButtonStateHandlerEvt.fire(true,this._carouselNext);}
if(this._isValidObj(this._carouselNext)){YAHOO.util.Event.addListener(this._carouselNext,"click",this._scrollNext,this);}},_isValidObj:function(obj){if(null==obj){return false;}
if("undefined"==typeof(obj)){return false;}
return true;}};