var cssdropdown = {

	disappeardelay: 200,
	dropdownindicator: '',
	enablereveal: [true, 5],
	////////////////////////
	dropmenuobj: null,
	asscmenuitem: null,
	domsupport: document.all || document.getElementById,
	standardbody: null,
	revealtimers: {},

	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;
	},

	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
	},

	showmenu: function (dropmenu, e) {
		if (this.enablereveal[0]) {
			if (!dropmenu._trueheight || dropmenu._trueheight < 10) dropmenu._trueheight = dropmenu.offsetHeight
			clearTimeout(this.revealtimers[dropmenu.id])
			dropmenu.style.height = dropmenu._curheight = 0
			dropmenu.style.overflow = "hidden"
			dropmenu.style.visibility = "visible"
			this.revealtimers[dropmenu.id] = setInterval(function () {
				cssdropdown.revealmenu(dropmenu)
			}, 10)
		} else {
			dropmenu.style.visibility = "visible"
		}
		this.css(this.asscmenuitem, "selected", "add")
	},

	revealmenu: function (dropmenu, dir) {
		var curH = dropmenu._curheight,
			maxH = dropmenu._trueheight,
			steps = this.enablereveal[1]
		if (curH < maxH) {
			var newH = Math.min(curH, maxH)
			dropmenu.style.height = newH + "px"
			dropmenu._curheight = newH + Math.round((maxH - newH) / steps) + 1
		} else { //if done revealing menu
			dropmenu.style.height = "auto"
			dropmenu.style.overflow = "hidden"
			clearInterval(this.revealtimers[dropmenu.id])
		}
	},

	clearbrowseredge: function (obj, whichedge) {
		var edgeoffset = 0
		if (whichedge == "rightedge") {
			var windowedge = document.all && !window.opera ? this.standardbody.scrollLeft + this.standardbody.clientWidth - 15 : window.pageXOffset + window.innerWidth - 15
			var dropmenuW = this.dropmenuobj.offsetWidth
			if (windowedge - this.dropmenuobj.x < dropmenuW) //move menu to the left?
			edgeoffset = dropmenuW - obj.offsetWidth
		} else {
			var topedge = document.all && !window.opera ? this.standardbody.scrollTop : window.pageYOffset
			var windowedge = document.all && !window.opera ? this.standardbody.scrollTop + this.standardbody.clientHeight - 15 : window.pageYOffset + window.innerHeight - 18
			var dropmenuH = this.dropmenuobj._trueheight
			if (windowedge - this.dropmenuobj.y < dropmenuH) { //move up?
				edgeoffset = dropmenuH + obj.offsetHeight
				if ((this.dropmenuobj.y - topedge) < dropmenuH) //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.hidemenu() //hide menu
		this.clearhidemenu()
		this.dropmenuobj = document.getElementById(dropmenuID) //reference drop down menu
		this.asscmenuitem = obj //reference associated menu item
		this.showmenu(this.dropmenuobj, 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"
	},


	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
	},

	dynamichide: function (m, e) {
		if (!this.isContained(m, e)) {
			this.delayhidemenu()
		}
	},

	delayhidemenu: function () {
		this.delayhide = setTimeout("cssdropdown.hidemenu()", this.disappeardelay) //hide menu
	},

	hidemenu: function () {
		this.css(this.asscmenuitem, "selected", "remove")
		this.dropmenuobj.style.visibility = 'hidden'
		this.dropmenuobj.style.left = this.dropmenuobj.style.top = "-1000px"
	},

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

	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)
		});
	},

	startchrome: function () {
		if (!this.domsupport) return
		this.standardbody = (document.compatMode == "CSS1Compat") ? document.documentElement : document.body
		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")
					var asscdropdownmenu = document.getElementById(relvalue)
					this.addEvent(asscdropdownmenu, function () {
						cssdropdown.clearhidemenu()
					}, "mouseover")
					this.addEvent(asscdropdownmenu, function (e) {
						cssdropdown.dynamichide(this, e)
					}, "mouseout")
					this.addEvent(asscdropdownmenu, function () {
						cssdropdown.delayhidemenu()
					}, "click")
					try {
						menuitems[i].innerHTML = menuitems[i].innerHTML + " " + this.dropdownindicator
					} catch (e) {}
					this.addEvent(menuitems[i], function (e) { //show drop down menu when main menu items are mouse over-ed
						if (!cssdropdown.isContained(this, e)) {
							var evtobj = window.event || e
							cssdropdown.dropit(this, evtobj, this.getAttribute("rel"))
						}
					}, "mouseover")
					this.addEvent(menuitems[i], function (e) {
						cssdropdown.dynamichide(this, e)
					}, "mouseout") //hide drop down menu when main menu items are mouse out
					this.addEvent(menuitems[i], function () {
						cssdropdown.delayhidemenu()
					}, "click") //hide drop down menu when main menu items are clicked on
				}
			} //end inner for
		} //end outer for
	} //end startchrome
}