var topmenu={

downarrowpointer: ["images/arrowdn.gif", 11,7], 
rightarrowpointer: ["images/arrowrt.gif", 12,12],
hideinterval: 200,
httpsiframesrc: "blank.htm",
topmenuids: [],
topitems: {},
subuls: {},
topitemsindex: -1,
ulindex: -1,
hidetimers: {},
getoffset:function(what, offsettype){
	return (what.offsetParent)? what[offsettype]+this.getoffset(what.offsetParent, offsettype) : what[offsettype]
},
getoffsetof:function(el){
	el._offsets={left:this.getoffset(el, "offsetLeft"), top:this.getoffset(el, "offsetTop")}
},
getwindowsize:function(){
	this.docwidth=window.innerWidth? window.innerWidth-10 : this.standardbody.clientWidth-10
	this.docheight=window.innerHeight? window.innerHeight-15 : this.standardbody.clientHeight-18
},
gettopitemsdimensions:function(){
	for (var m=0; m<this.topmenuids.length; m++){
		var topmenuid=this.topmenuids[m]
		for (var i=0; i<this.topitems[topmenuid].length; i++){
			var header=this.topitems[topmenuid][i]
			var submenu=document.getElementById(header.parentNode.getAttribute('rel'))
			header._dimensions={w:header.offsetWidth, h:header.offsetHeight, submenuw:submenu.offsetWidth, submenuh:submenu.offsetHeight}
		}
	}
},
isContained:function(m, e){
	var e=window.event || e
	var c=e.relatedTarget || ((e.type=="mouseover")? e.fromElement : e.toElement)
	while (c && c!=m)try {c=c.parentNode} catch(e){c=m}
	if (c==m)
		return true
	else
		return false
},
addpointer:function(target, imgclass, imginfo){
	var pointer=document.createElement("img")
	pointer.src=imginfo[0]
	pointer.style.width=imginfo[1]+"px"
	pointer.style.height=imginfo[2]+"px"
	pointer.className=imgclass
	target.appendChild(pointer)
},
css:function(el, targetclass, action){
	var needle=new RegExp("(^|\\s+)"+targetclass+"($|\\s+)", "ig")
	if (action=="check")
		return needle.test(el.className)
	else if (action=="remove")
		el.className=el.className.replace(needle, "")
	else if (action=="add" && !needle.test(el.className))
		el.className+=" "+targetclass
},
buildmenu:function(mainmenuid, header, submenu, submenupos, istoplevel, dir){
	header._master=mainmenuid
	header._pos=submenupos
	header._istoplevel=istoplevel
	if (istoplevel){
		this.addEvent(header, function(e){
		topmenu.hidemenu(topmenu.subuls[this._master][parseInt(this._pos)])
		}, "click")
	}
	this.subuls[mainmenuid][submenupos]=submenu
	header._dimensions={w:header.offsetWidth, h:header.offsetHeight, submenuw:submenu.offsetWidth, submenuh:submenu.offsetHeight}
	this.getoffsetof(header)
	submenu.style.left=0
	submenu.style.top=0
	submenu.style.visibility="hidden"
	this.addEvent(header, function(e){
		if (!topmenu.isContained(this, e)){
			if (typeof topmenu.hidetimers[this._master][parseInt(this._pos)]!="undefined")
				clearTimeout(topmenu.hidetimers[this._master][parseInt(this._pos)])
			if (this._istoplevel)
				topmenu.css(this, "selected", "add")
			var submenu=topmenu.subuls[this._master][parseInt(this._pos)]
			topmenu.getoffsetof(header)
			var scrollX=window.pageXOffset? window.pageXOffset : topmenu.standardbody.scrollLeft
			var scrollY=window.pageYOffset? window.pageYOffset : topmenu.standardbody.scrollTop
			var submenurightedge=this._offsets.left + this._dimensions.submenuw + (this._istoplevel && dir=="topbar"? 0 : this._dimensions.w)
			var submenubottomedge=this._offsets.top + this._dimensions.submenuh
			var menuleft=(this._istoplevel? this._offsets.left + (dir=="sidebar"? this._dimensions.w : 0) : this._dimensions.w)
			if (submenurightedge-scrollX>topmenu.docwidth){
				menuleft+= -this._dimensions.submenuw + (this._istoplevel && dir=="topbar" ? this._dimensions.w : -this._dimensions.w)
			}
			submenu.style.left=menuleft+"px"

			var menutop=(this._istoplevel? this._offsets.top + (dir=="sidebar"? 0 : this._dimensions.h) : this.offsetTop)
			if (submenubottomedge-scrollY>topmenu.docheight){
				menutop+= - this._dimensions.submenuh + (this._istoplevel && dir=="topbar"? -this._dimensions.h : this._dimensions.h)
			}
			submenu.style.top=menutop+"px"			
			submenu.style.visibility="visible"
		}
	}, "mouseover")
	this.addEvent(header, function(e){ 
		if (this._istoplevel){
			var submenu=topmenu.subuls[this._master][parseInt(this._pos)]
			if (!topmenu.isContained(this, e) && !topmenu.isContained(submenu, e))
				topmenu.hidemenu(submenu)
		}
		else if (!this._istoplevel && !topmenu.isContained(this, e)){
			var headerlist=this
			topmenu.hidetimers[this._master][parseInt(this._pos)]=setTimeout(function(){
				var submenu=topmenu.subuls[headerlist._master][parseInt(headerlist._pos)]
				topmenu.hidemenu(submenu)
			}, topmenu.hideinterval)
		}
	}, "mouseout")
},
hidemenu:function(submenu){
	if (typeof submenu._pos!="undefined"){
		this.css(this.topitems[submenu._master][parseInt(submenu._pos)], "selected", "remove")
	}
	submenu.style.left=0
	submenu.style.top="-1000px"
	submenu.style.visibility="hidden"
},
addEvent:function(target, functionref, tasktype) {
	if (target.addEventListener)
		target.addEventListener(tasktype, functionref, false);
	else if (target.attachEvent)
		target.attachEvent('on'+tasktype, function(){return functionref.call(target, window.event)});
},
init:function(mainmenuid, dir){
	this.standardbody=(document.compatMode=="CSS1Compat")? document.documentElement : document.body
	this.topitemsindex=-1
	this.ulindex=-1
	this.topmenuids.push(mainmenuid)
	this.topitems[mainmenuid]=[]
	this.subuls[mainmenuid]=[]
	this.hidetimers[mainmenuid]=[]
	var menubar=document.getElementById(mainmenuid)
	var menuitems=menubar.getElementsByTagName("*")
	this.getwindowsize()
	for (var i=0; i<menuitems.length; i++){
		if (menuitems[i].getAttribute('rel')){
			this.topitemsindex++
			this.ulindex++
			var menulink=menuitems[i].getElementsByTagName("a")[0]
			this.topitems[mainmenuid][this.topitemsindex]=menulink
			var dropul=document.getElementById(menuitems[i].getAttribute('rel'))
			dropul.style.zIndex=2000
			dropul._master=mainmenuid
			dropul._pos=this.topitemsindex
			this.addEvent(dropul, function(){topmenu.hidemenu(this)}, "click")
			var arrowpointer=(dir=="sidebar")? "rightarrowpointer" : "downarrowpointer"
			this.addpointer(menulink, arrowpointer, this[arrowpointer])
			this.buildmenu(mainmenuid, menulink, dropul, this.ulindex, true, dir)
			this.addEvent(dropul, function(e){
				if (!topmenu.isContained(this, e) && !topmenu.isContained(topmenu.topitems[this._master][parseInt(this._pos)], e)){
					var dropul=this
					topmenu.hidetimers[this._master][parseInt(this._pos)]=setTimeout(function(){
						topmenu.hidemenu(dropul)
					}, topmenu.hideinterval)
				}
			}, "mouseout")
			var subuls=dropul.getElementsByTagName("ul")
			for (var c=0; c<subuls.length; c++){
				this.ulindex++
				var parentli=subuls[c].parentNode
				this.addpointer(parentli.getElementsByTagName("a")[0], "rightarrowpointer", this.rightarrowpointer)
				this.buildmenu(mainmenuid, parentli, subuls[c], this.ulindex, false, dir)
			}
		}
	}
	this.addEvent(window, function(){topmenu.getwindowsize(); topmenu.gettopitemsdimensions()}, "resize")
},
setup:function(mainmenuid, dir){
	this.addEvent(window, function(){topmenu.init(mainmenuid, dir)}, "load")
}
}