var tabdropdown={
disappeardelay: 250, 
disablemenuclick: true, 
downsymbol: '', 

dropmenuobj: null, ie: document.all, firefox: document.getElementById&&!document.all, previousmenuitem:null,

	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;
	},

	showhide:function(obj, e, obj2){ //obj refers to drop down menu, obj2 refers to tab menu item mouse is currently over
		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 (obj2.parentNode.className.indexOf("default")==-1) //if tab isn't a default selected one
			obj2.parentNode.className="selected"
			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
				}
				this.dropmenuobj.style.borderTopWidth=(edgeoffset==0)? 0 : "1px" //Add 1px top border to menu if dropping up
			}
		return edgeoffset
		},

		dropit:function(obj, e, dropmenuID){
		if (this.dropmenuobj!=null){ //hide previous menu
			this.dropmenuobj.style.visibility="hidden" //hide menu
		if (this.previousmenuitem!=null && this.previousmenuitem!=obj){
		if (this.previousmenuitem.parentNode.className.indexOf("default")==-1) //If the tab isn't a default selected one
			this.previousmenuitem.parentNode.className=""
			tabdropdown.togglehiddenobj(this.previousmenuitem, 'visible')
			
		}
	}
	this.clearhidemenu()
	if (this.ie||this.firefox){
		obj.onmouseout=function(){tabdropdown.delayhidemenu(obj)}
		obj.onclick=function(){return !tabdropdown.disablemenuclick} //disable main menu item link onclick?
		this.dropmenuobj=document.getElementById(dropmenuID)
		this.dropmenuobj.onmouseover=function(){tabdropdown.clearhidemenu()}
		this.dropmenuobj.onmouseout=function(e){tabdropdown.dynamichide(e, obj)}
		this.dropmenuobj.onclick=function(){tabdropdown.delayhidemenu(obj)}
		this.showhide(this.dropmenuobj.style, e, obj)
		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+"px"
		this.previousmenuitem=obj //remember main menu item mouse moved out from (and into current menu item)
		tabdropdown.togglehiddenobj(obj, "hidden") //Hide (form) object drop down menu overlaps, if any
	}
	},

	togglehiddenobj:function(obj2, visible){
	var revvalue=obj2.getAttribute("rev")
	if (typeof revvalue=="string" && revvalue.length>0 && document.getElementById(revvalue)!=null)
		document.getElementById(revvalue).style.visibility=visible
	},

	contains_firefox:function(a, b) {
	while (b.parentNode)
	if ((b = b.parentNode) == a)
	return true;
	return false;
	},

	dynamichide:function(e, obj2){ //obj2 refers to tab menu item mouse is currently over
	var evtobj=window.event? window.event : e
	if (this.ie&&!this.dropmenuobj.contains(evtobj.toElement))
	this.delayhidemenu(obj2)
	else if (this.firefox&&e.currentTarget!= evtobj.relatedTarget&& !this.contains_firefox(evtobj.currentTarget, evtobj.relatedTarget))
	this.delayhidemenu(obj2)
	},

	delayhidemenu:function(obj2){
		this.delayhide=setTimeout(function(){tabdropdown.dropmenuobj.style.visibility='hidden'; if (obj2.parentNode.className.indexOf('default')==-1) obj2.parentNode.className=''; tabdropdown.togglehiddenobj(obj2, 'visible')},this.disappeardelay) //hide menu
	},

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

	initializetabmenu:function(menuid, opt_selectedmenuitem){
	var menuitems=document.getElementById(menuid).getElementsByTagName("a")
	for (var i=0; i<menuitems.length; i++){
		if (parseInt(opt_selectedmenuitem)==i)
			menuitems[i].parentNode.className+=" selected default"
		if (menuitems[i].getAttribute("rel")){
			var relvalue=menuitems[i].getAttribute("rel")
			menuitems[i].onmouseover=function(e){
			var event=typeof e!="undefined"? e : window.event
		tabdropdown.dropit(this, event, this.getAttribute("rel"))
		}
		if (tabdropdown.downsymbol!="")
			menuitems[i].innerHTML+=tabdropdown.downsymbol 
		}
	}
}

}