//Drop Down Tabs Menu- Author: Dynamic Drive (http://www.dynamicdrive.com)
//Created: May 16th, 07'

var tabdropdown = {
	disappeardelay: 200, //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?
	enableiframeshim: 1, //1 or 0, for true or false

	//No need to edit beyond here////////////////////////
	dropmenuobj: null, ie: document.all, firefox: document.getElementById && !document.all, previousmenuitem: null,
	currentpageurl: window.location.href.replace("http://" + window.location.hostname, "").replace(/^\//, ""), //get current page url (minus hostname, ie: http://www.dynamicdrive.com/)

	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 = "110px"
		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.standardbody.scrollLeft + this.standardbody.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.standardbody.scrollTop : window.pageYOffset
			var windowedge = this.ie && !window.opera ? this.standardbody.scrollTop + this.standardbody.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.firstlink.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 = ""
			}
		}
		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 + 1 + "px"
			this.previousmenuitem = obj //remember main menu item mouse moved out from (and into current menu item)
			this.positionshim() //call iframe shim function
		}
	},

	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 = '' }, this.disappeardelay) //hide menu
	},

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

	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'
	},

	isSelected: function (menuurl) {
		var menuurl = menuurl.replace("http://" + menuurl.hostname, "").replace(/^\//, "")
		return (tabdropdown.currentpageurl == menuurl)
	},

	init: function (menuid, dselected) {
		this.standardbody = (document.compatMode == "CSS1Compat") ? document.documentElement : document.body //create reference to common "body" across doctypes
		var menuitems = document.getElementById(menuid).getElementsByTagName("a")
		for (var i = 0; i < menuitems.length; i++) {
			if (menuitems[i].getAttribute("rel")) {
				var relvalue = menuitems[i].getAttribute("rel")
				document.getElementById(relvalue).firstlink = document.getElementById(relvalue).getElementsByTagName("a")[0]
				menuitems[i].onmouseover = function (e) {
					var event = typeof e != "undefined" ? e : window.event
					tabdropdown.dropit(this, event, this.getAttribute("rel"))
				}
			}
			if (dselected == "auto" && typeof setalready == "undefined" && this.isSelected(menuitems[i].href)) 
			{
				//menuitems[i].parentNode.className+=" selected default"
				var setalready = true
			}
			else if (parseInt(dselected) == i) 
			{
				//menuitems[i].parentNode.className+=" selected default"
			}
		}
	}

}