//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,
	tabs: null,
	lastTab: -1,

	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))
		{
		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
		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=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();cssdropdown.resetbackimage();",this.disappeardelay) //hide menu
	},

	clearhidemenu:function()
	{
		if (this.delayhide!="undefined")
		clearTimeout(this.delayhide)
	},

	resetbackimage:function()
	{
		if(cssdropdown.lastTab >= 0)
		{
			var theTab = cssdropdown.tabs[cssdropdown.lastTab];
			if(theTab)
			{
				var offImage = theTab.getAttribute("offimage");
				if(offImage)
				{
					var imageID = theTab.getAttribute("imageid");
										
					if(imageID)
					{
						document.getElementById(imageID).src = offImage;
					}
				}
			}
		}
	},
	
	
	startchrome:function()
	{
		for (var ids=0; ids<arguments.length; ids++)
		{
			var menuitems=document.getElementById(arguments[ids]).getElementsByTagName("a")
			
			// Right now only the top level tab list is needed
			// top level tabs must be first in argument list
			if(ids == 0)
			{
				this.tabs = new Array(menuitems.length);
			}
			
			for (var i=0; i<menuitems.length; i++)
			{
				// Keep a list of references to the top level tab objects
				if(ids == 0)
				{
					this.tabs[i] = menuitems[i];
				}

				var offImage = menuitems[i].getAttribute("offimage");
				if(offImage)
				{
					var newAtt = document.createAttribute("imageid");
					newAtt.value = "img" + ids + i;
					menuitems[i].innerHTML = "<img border='0' id='" + newAtt.value + "' src='" + offImage + "'/>";
					menuitems[i].setAttributeNode(newAtt);					
				}

				var relvalue = menuitems[i].getAttribute("rel");
				
				if (relvalue)
				{
					var subItems = document.getElementById(relvalue).getElementsByTagName("a");
					
					for(z = 0;z < subItems.length;z++)
					{
						newAtt = document.createAttribute("tabid");
						newAtt.value = i;
						subItems[z].setAttributeNode(newAtt);
					}

					newAtt = document.createAttribute("mytabid");
					newAtt.value = i;
					menuitems[i].setAttributeNode(newAtt);
					
					menuitems[i].onmouseover=function(e)
					{
						var event=typeof e!="undefined"? e : window.event;
						cssdropdown.dropit(this,event,this.getAttribute("rel"));
						var onImage = this.getAttribute("onimage");
						if(onImage)
						{
							var imageID = this.getAttribute("imageid");
									
							if(imageID)
							{
								document.getElementById(imageID).src = onImage;
							}
						}	
						
						var mytabid = this.getAttribute("mytabid");
						if(mytabid && cssdropdown.lastTab != mytabid)
						{
							cssdropdown.resetbackimage();
							cssdropdown.lastTab = mytabid;
						}					
					}
				}
				else
				{
					menuitems[i].onmouseover=function()
					{
						var onImage = this.getAttribute("onimage");
						if(onImage)
						{
							var imageID = this.getAttribute("imageid");
									
							if(imageID)
							{
								document.getElementById(imageID).src = onImage;
							}
						}						
					}
					menuitems[i].onmouseout=function()
					{
						var offImage = this.getAttribute("offimage");
						if(offImage)
						{
							var imageID = this.getAttribute("imageid");
								
							if(imageID)
							{
								document.getElementById(imageID).src = offImage;
							}
						}
						
						var tabId = this.getAttribute("tabid");
						
						if(tabId)
						{
							cssdropdown.lastTab = tabId;
						}
					}
				}
			}
		}
		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
		}
	}

}