//Chrome Drop Down Menu v2.01- Author: Dynamic Drive (http://www.dynamicdrive.com)
//Last updated: November 14th 06- added iframe shim technique

var cssdropdown={
	disappeardelay: 950, //set delay in miliseconds before menu disappears onmouseout
	disablemenuclick: true, //when user clicks on a menu item with a drop down menu, disable menu item's link?
	enableswipe: 1, //enable swipe effect? 1 for yes, 0 for no
	enableiframeshim: 0, //enable "iframe shim" technique to get drop down menus to correctly appear on top of controls such as form objects in IE5.5/IE6? 1 for yes, 0 for no

	//No need to edit beyond here////////////////////////
	dropmenuobj: null, ie: document.all, firefox: document.getElementById&&!document.all, swipetimer: undefined, bottomclip:0,

	getposOffset:function(what, offsettype){
		var totaloffset=(offsettype=="left") ? what.offsetLeft : what.offsetTop;
		var parentEl=what.offsetParent;
		while (parentEl!==null){
			totaloffset=(offsettype=="left")? totaloffset+parentEl.offsetLeft : totaloffset+parentEl.offsetTop;
			parentEl=parentEl.offsetParent;
		}
		return totaloffset;
	},

	swipeeffect:function(){
		if (this.bottomclip<parseInt(this.dropmenuobj.offsetHeight,1)){
			this.bottomclip+=10+(this.bottomclip/10); //unclip drop down menu visibility gradually
			this.dropmenuobj.style.clip="rect(0 auto "+this.bottomclip+"px 0)";
		}
		else{
			return;
		} 
		this.swipetimer=setTimeout("cssdropdown.swipeeffect()", 10);
	},

	showhide:function(obj, e){
		if (this.ie || this.firefox){
			this.dropmenuobj.style.left=this.dropmenuobj.style.top="-500px";
		}
		if (e.type=="click" && obj.visibility==hidden || e.type=="mouseover"){
			if (this.enableswipe==1){
				if (typeof this.swipetimer!="undefined"){
					clearTimeout(this.swipetimer);
				}
				obj.clip="rect(0 auto 0 0)"; //hide menu via clipping
				this.bottomclip=0;
				this.swipeeffect();
			}
			obj.visibility="visible";
		}
		else if (e.type=="click"){
			obj.visibility="hidden";
		}
	},

	iecompattest:function(){
		return (document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body;
	},

	clearbrowseredge:function(obj, whichedge){
		var edgeoffset=0;
		var windowedge;
		if (whichedge=="rightedge"){
			windowedge=this.ie && !window.opera? this.iecompattest().scrollLeft+this.iecompattest().clientWidth-15 : window.pageXOffset+window.innerWidth-15;
			this.dropmenuobj.contentmeasure=this.dropmenuobj.offsetWidth;
			if (windowedge-this.dropmenuobj.x < this.dropmenuobj.contentmeasure){  //move menu to the left?
				edgeoffset=this.dropmenuobj.contentmeasure-obj.offsetWidth;
			}
		}
		else{
			var topedge=this.ie && !window.opera? this.iecompattest().scrollTop : window.pageYOffset;
			windowedge=this.ie && !window.opera? this.iecompattest().scrollTop+this.iecompattest().clientHeight-15 : window.pageYOffset+window.innerHeight-18;
			this.dropmenuobj.contentmeasure=this.dropmenuobj.offsetHeight;
			if (windowedge-this.dropmenuobj.y < this.dropmenuobj.contentmeasure){ //move up?
				edgeoffset=this.dropmenuobj.contentmeasure+obj.offsetHeight;
				if ((this.dropmenuobj.y-topedge)<this.dropmenuobj.contentmeasure){ //up no good either?
					edgeoffset=this.dropmenuobj.y+obj.offsetHeight-topedge;
				}
			}
		}
		return edgeoffset;
	},

	dropit:function(obj, e, dropmenuID){
		if (this.dropmenuobj!==null){ //hide previous menu
			this.dropmenuobj.style.visibility="hidden"; //hide menu
			this.clearhidemenu();
		}
		if (this.ie||this.firefox){
			obj.onmouseout=function(){cssdropdown.delayhidemenu();};
			obj.onclick=function(){return !cssdropdown.disablemenuclick;}; //disable main menu item link onclick?
			this.dropmenuobj=document.getElementById(dropmenuID);
			this.dropmenuobj.onmouseover=function(){cssdropdown.clearhidemenu();};
			this.dropmenuobj.onmouseout=function(e){cssdropdown.dynamichide(e);};
			this.dropmenuobj.onclick=function(){cssdropdown.delayhidemenu();};
			this.showhide(this.dropmenuobj.style, e);
			this.dropmenuobj.x=this.getposOffset(obj, "left");
			this.dropmenuobj.y=this.getposOffset(obj, "top");
			this.dropmenuobj.style.left=this.dropmenuobj.x-this.clearbrowseredge(obj, "rightedge")+"px";
			this.dropmenuobj.style.top=this.dropmenuobj.y-this.clearbrowseredge(obj, "bottomedge")+obj.offsetHeight+1+"px";
			this.positionshim(); //call iframe shim function
		}
	},

	positionshim:function(){ //display iframe shim function
		if (this.enableiframeshim && typeof this.shimobject!="undefined"){
			if (this.dropmenuobj.style.visibility=="visible"){
				this.shimobject.style.width=this.dropmenuobj.offsetWidth+"px";
				this.shimobject.style.height=this.dropmenuobj.offsetHeight+"px";
				this.shimobject.style.left=this.dropmenuobj.style.left;
				this.shimobject.style.top=this.dropmenuobj.style.top;
			}
			this.shimobject.style.display=(this.dropmenuobj.style.visibility=="visible")? "block" : "none";
		}
	},
		
	hideshim:function(){
		if (this.enableiframeshim && typeof this.shimobject!="undefined"){
			this.shimobject.style.display='none';
		}
	},
	
	contains_firefox:function(a, b) {
		while (b.parentNode){
			if ((b = b.parentNode) == a){
				return true;
			}
		}
		return false;
	},
	
	dynamichide:function(e){
		var evtobj=window.event? window.event : e;
		if (this.ie&&!this.dropmenuobj.contains(evtobj.toElement)){
			this.delayhidemenu();
		}
		else if (this.firefox&&e.currentTarget!= evtobj.relatedTarget&& !this.contains_firefox(evtobj.currentTarget, evtobj.relatedTarget)){
			this.delayhidemenu();
		}
	},
	
	delayhidemenu:function(){
		this.delayhide=setTimeout("cssdropdown.dropmenuobj.style.visibility='hidden'; cssdropdown.hideshim()",this.disappeardelay); //hide menu
	},
	
	clearhidemenu:function(){
		if (this.delayhide!="undefined"){
			clearTimeout(this.delayhide);
		}
	},
	
	startchrome:function(){
		for (var ids=0; ids<arguments.length; ids++){
			var menuitems=document.getElementById(arguments[ids]).getElementsByTagName("a")
			for (var i=0; i<menuitems.length; i++){
				if (menuitems[i].getAttribute("rel")){
					var relvalue=menuitems[i].getAttribute("rel")
					menuitems[i].onmouseover=function(e){
						var event=typeof e!="undefined"? e : window.event
						cssdropdown.dropit(this,event,this.getAttribute("rel"))
					}
					var submenuitems=menuitems[i].getElementsByTagName("a")
					for (var j=0; j<submenuitems.length; j++){
						if (submenuitems[j].getAttribute("rel")){
							var subrelvalue=submenuitems[j].getAttribute("rel")
							submenuitems[j].onmouseover=function(e){
								var subevent=typeof e!="undefined"? e : window.event
								cssdropdown.dropit(this,subevent,this.getAttribute("rel"))
							}
						}
					}
				}
			}
		}
		if (window.createPopup && !window.XmlHttpRequest){ //if IE5.5 to IE6, create iframe for iframe shim technique
			document.write('<IFRAME id="iframeshim"  src="" style="display: none; left: 0; top: 0; z-index: 90; position: absolute; filter: progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=0)" frameBorder="0" scrolling="no"></IFRAME>')
			this.shimobject=document.getElementById("iframeshim") //reference iframe object
		}
	}

}