//Drop Down/ Overlapping Content: http://www.dynamicdrive.com
//**Updated: Dec 19th, 07': Added ability to dynamically populate a Drop Down content using an external file (Ajax feature)
//**Updated: Feb 29th, 08':
				//1) Added ability to reveal drop down content via "click" of anchor link (instead of default "mouseover")
				//2) Added ability to disable drop down content from auto hiding when mouse rolls out of it
				//3) Added hidediv(id) public function to directly hide drop down div dynamically

var dropdowncontent={
	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?

	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;
		}
	},

	show:function(anchorobj, subobj, e){
		if (!this.isContained(anchorobj, e)){
			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
			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(){dropdowncontent.slideengine(obj, direction)}, 10);
		}
		else{ //if animation finished
			obj.style.clip="rect(0 auto auto 0)";
		}
	},

	hide:function(activeobj, subobj, e){
		if (!dropdowncontent.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]);
			}, dropdowncontent.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(){dropdowncontent.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){
 		
 		//window.eval('dropdowncontentController = this;');
 		
		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){dropdowncontent.show(this, subobj, e)};
			anchorobj.onmouseout=function(e){dropdowncontent.hide(subobj, subobj, e)};
			if (this.disableanchorlink){ anchorobj.onclick=function(){return false};}
		}
		else{
			anchorobj.onclick=function(e){dropdowncontent.show(this, subobj, e); return false};
		}
		if (this.hidedivmouseout[0]==true){ //hide drop down DIV when mouse rolls out of it?
			subobj.onmouseout=function(e){dropdowncontent.hide(this, subobj, e)};
		}
	}
}