var CartMenu={
	isIE6 : ((navigator.userAgent.toLowerCase().indexOf('msie 6') != -1) && (navigator.userAgent.toLowerCase().indexOf('msie 7') == -1)),
	anchorid: '',
	disableanchorlink: true, //when user clicks on anchor link, should link itself be disabled (always true if "revealbehavior" above set to "click")
 	Hidedivmouseout: [true, 200], //Set hiding behavior within Drop Down DIV itself: [Hide_div_onmouseover?, miliseconds_before_hiding]
	ajaxloadingmsg: "Loading content. Please wait...", //HTML to Show while ajax page is being feched, if applicable
	ajaxbustcache: true, //Bust cache when fetching Ajax pages?
	albumPushRight: 0, //Push album menu right
	trackPushRight: 0, //Push track menu right

	GetPosOffset:function(what, offsettype){
		return (what.offsetParent)? what[offsettype]+this.GetPosOffset(what.offsetParent, offsettype) : what[offsettype]
	},

	IsContained:function(m, e){
		var e=window.event || e
		var c=e.relatedTarget || ((e.type=="mouseover")? e.fromElement : e.toElement)
		while (c && c!=m)try {c=c.parentNode} catch(e){c=m}
		if (c==m)
			return true
		else
			return false
	},
	
	OpenCheck:function (e) {
    	var target = (e && e.target) || (event && event.srcElement);
		var anchorobj=document.getElementById(CartMenu.anchorid);
		var subobj=document.getElementById(anchorobj.getAttribute("rel"))
		if(target!=anchorobj){CartMenu.Hide(anchorobj, subobj, e)}
	},

	Show:function(anchorobj, subobj, e){
		if (!this.IsContained(anchorobj, e) || (e && e.type=="click")){
			var e=window.event || e
			if (e.type=="click" && subobj.style.visibility=="visible"){
				subobj.style.visibility="hidden"
				return
			}
			var horizontaloffset=(subobj.dropposition[0]=="left")? -(subobj.offsetWidth-anchorobj.offsetWidth) : 0 //calculate user added horizontal offset
			if(anchorobj.id.indexOf('album')!==-1){
	 			horizontaloffset += CartMenu.albumPushRight;
			}else{
				horizontaloffset += CartMenu.trackPushRight;
			}
			var verticaloffset=(subobj.dropposition[1]=="top")? -subobj.offsetHeight : anchorobj.offsetHeight //calculate user added vertical offset
			subobj.style.left=this.GetPosOffset(anchorobj, "offsetLeft") + horizontaloffset + "px"
			subobj.style.top=this.GetPosOffset(anchorobj, "offsetTop")+verticaloffset+"px"
			subobj.style.clip=(subobj.dropposition[1]=="top")? "rect(auto auto auto 0)" : "rect(0 auto 0 0)" //Hide drop down box Initially via clipping
			subobj.style.visibility="visible"
			subobj.startTime=new Date().getTime()
			subobj.contentheight=parseInt(subobj.offsetHeight)
			if (typeof window["Hidetimer_"+subobj.id]!="undefined") //clear timer that Hides drop down box?
				clearTimeout(window["Hidetimer_"+subobj.id])
			this.SlideEngine(subobj, (subobj.dropposition[1]=="top")? "up" : "down")
		}
	},

	CurveIncrement:function(percent){
		return (1-Math.cos(percent*Math.PI)) / 2 //return cos curve based value from a percentage input
	},

	SlideEngine:function(obj, direction){
		var elapsed=new Date().getTime()-obj.startTime //get time animation has run
		if (elapsed<obj.glidetime){ //if time run is less than specified length
			var distancepercent=(direction=="down")? this.CurveIncrement(elapsed/obj.glidetime) : 1-this.CurveIncrement(elapsed/obj.glidetime)
			var currentclip=(distancepercent*obj.contentheight)+"px"
			obj.style.clip=(direction=="down")? "rect(0 auto "+currentclip+" 0)" : "rect("+currentclip+" auto auto 0)"
			window["glidetimer_"+obj.id]=setTimeout(function(){CartMenu.SlideEngine(obj, direction)}, 10)
		}
		else{ //if animation finished
			obj.style.clip="rect(0 auto auto 0)"
		}
	},

	Hide:function(activeobj, subobj, e){
		if (!CartMenu.IsContained(activeobj, e)){
			window["Hidetimer_"+subobj.id]=setTimeout(function(){
				subobj.style.visibility="hidden"
				subobj.style.left=subobj.style.top=0
				clearTimeout(window["glidetimer_"+subobj.id])
			}, CartMenu.Hidedivmouseout[1])
		}
	},

	Hidediv:function(subobjid){
		document.getElementById(subobjid).style.visibility="hidden"
	},

	AjaxConnect:function(pageurl, divId){
		var page_request = false
		var bustcacheparameter=""
		if (window.XMLHttpRequest) // if Mozilla, IE7, Safari etc
			page_request = new XMLHttpRequest()
		else if (window.ActiveXObject){ // if IE6 or below
			try {
			page_request = new ActiveXObject("Msxml2.XMLHTTP")
			} 
			catch (e){
				try{
				page_request = new ActiveXObject("Microsoft.XMLHTTP")
				}
				catch (e){}
			}
		}
		else
			return false
		document.getElementById(divId).innerHTML=this.ajaxloadingmsg //Display "fetching page message"
		page_request.onreadystatechange=function(){CartMenu.loadpage(page_request, divId)}
		if (this.ajaxbustcache) //if bust caching of external page
			bustcacheparameter=(pageurl.indexOf("?")!=-1)? "&"+new Date().getTime() : "?"+new Date().getTime()
		page_request.open('GET', pageurl+bustcacheparameter, true)
		page_request.send(null)
	},

	loadpage:function(page_request, divId){
		if (page_request.readyState == 4 && (page_request.status==200 || window.location.href.indexOf("http")==-1)){
			document.getElementById(divId).innerHTML=page_request.responseText
		}
	},

	Init:function(anchorid, pos, glidetime, revealbehavior, pushRight)
	{
 		if(anchorid.indexOf('album')!==-1){
 			CartMenu.albumPushRight = pushRight;
		}else{
			CartMenu.trackPushRight = pushRight;
		}
 		this.anchorid = anchorid;
		var anchorobj=document.getElementById(anchorid)
		var subobj=document.getElementById(anchorobj.getAttribute("rel"))
		var subobjsource=anchorobj.getAttribute("rev")
		if (subobjsource!=null && subobjsource!="")
			this.AjaxConnect(subobjsource, anchorobj.getAttribute("rel"))
		subobj.dropposition=pos.split("-")
		subobj.glidetime=glidetime || 1000
		subobj.style.left=subobj.style.top=0
		if (typeof revealbehavior=="undefined" || revealbehavior=="mouseover"){
			anchorobj.onmouseover=function(e){CartMenu.Show(this, subobj, e)}
			anchorobj.onmouseout=function(e){CartMenu.Hide(subobj, subobj, e)}
			if (this.disableanchorlink) anchorobj.onclick=function(){return false}
		}
		else
			anchorobj.onclick=function(e){CartMenu.Show(this, subobj, e); return false}
		
		// comment out the following if dont want to capture body onclick
		// becasue ei6 doesn't play ball
		/*
		if(!CartMenu.isIE6){
			document.captureEvents(Event.CLICK);
			document.onclick=CartMenu.OpenCheck;
			CartMenu.Hidedivmouseout[0] = false;
		}
		// end comment block
		*/
		
		if (this.Hidedivmouseout[0]==true) //Hide drop down DIV when mouse rolls out of it?
			subobj.onmouseout=function(e){CartMenu.Hide(this, subobj, e)}
	}
}