//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: 250, //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: 1, //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,
	
	Firefox : (navigator.userAgent.indexOf("Firefox") >= 0 ) ? true : false,
	MSIE : (navigator.userAgent.indexOf("MSIE") >= 0 ) ? true : false,
	Mozilla : (navigator.userAgent.indexOf("Mozilla") >= 0 ) ? true : false,
	Opera : (navigator.userAgent.indexOf("Opera") >= 0 ) ? true : false,
	
	getposOffset : function(what, offsettype)
	{
		
		var totaloffset = (offsettype == "left")? what.offsetLeft : what.offsetTop;
		var parentEl=what.offsetParent;
		while (parentEl!=null)
		{
			if (this.MSIE)
				totaloffset = (offsettype == "left")? totaloffset+parentEl.offsetLeft-18.5 : totaloffset+parentEl.offsetTop;
			else if (this.Firefox || this.Mozilla)
				totaloffset = (offsettype == "left")? totaloffset+parentEl.offsetLeft-9.5 : totaloffset+parentEl.offsetTop;
			else if (this.Opera)
			{ /*opera wont work.*/ }	
			
			parentEl =parentEl.offsetParent;
		}
		return totaloffset;
	},

	swipeeffect : function()
	{
		if (this.bottomclip<parseInt(this.dropmenuobj.offsetHeight))
		{
			this.bottomclip += 5 + (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;
		if (whichedge=="rightedge")
		{
			var 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
			var 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 = parseInt(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"));
					}
				}
			}
		}

		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
		}
	}
}