//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: false, //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,

	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.dropmenuobj != null)
		{
			if (this.bottomclip<parseInt(this.dropmenuobj.offsetHeight))
			{
				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.dropmenuobj != null)
		{
			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)
	{
		if (this.dropmenuobj != null)
		{
			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()
			{//disable main menu item link onclick?
				return !cssdropdown.disablemenuclick
			} 
			this.dropmenuobj=document.getElementById(dropmenuID)
			if (this.dropmenuobj != null)
			{
				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")-15+"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()
	{
		if (cssdropdown.dropmenuobj != null)
		{
			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("li")
			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.getElementsByTagName("a")[0],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
		}
	}
}