//** Chrome Drop Down Menu- Author: Dynamic Drive (http://www.dynamicdrive.com)



//** Updated: July 14th 06' to v2.0

	//1) Ability to "left", "center", or "right" align the menu items easily, just by modifying the CSS property "text-align".

	//2) Added an optional "swipe down" transitional effect for revealing the drop down menus.

	//3) Support for multiple Chrome menus on the same page.



//** Updated: Nov 14th 06' to v2.01- added iframe shim technique



//** Updated: July 23rd, 08 to v2.4

	//1) Main menu items now remain "selected" (CSS class "selected" applied) when user moves mouse into corresponding drop down menu. 

	//2) Adds ability to specify arbitrary HTML that gets added to the end of each menu item that carries a drop down menu (ie: a down arrow image).

	//3) All event handlers added to the menu are now unobstrusive, allowing you to define your own "onmouseover" or "onclick" events on the menu items.

	//4) Fixed elusive JS error in FF that sometimes occurs when mouse quickly moves between main menu items and drop down menus



//** Updated: Oct 29th, 08 to v2.5 (only .js file modified from v2.4)

	//1) Added ability to customize reveal animation speed (# of steps)

	//2) Menu now works in IE8 beta2 (a valid doctype at the top of the page is required)



var cssdropdown={

disappeardelay: 250, //set delay in miliseconds before menu disappears onmouseout

dropdownindicator: '', //specify full HTML to add to end of each menu item with a drop down menu

enablereveal: [true, 5], //enable swipe effect? [true/false, steps (Number of animation steps. Integer between 1-20. Smaller=faster)]

enableiframeshim: 1, //enable "iframe shim" in IE5.5 to IE7? (1=yes, 0=no)



//No need to edit beyond here////////////////////////



dropmenuobj: null, asscmenuitem: null, domsupport: document.all || document.getElementById, standardbody: null, iframeshimadded: false, 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"

	this.positionshim() //call iframe shim function

},



positionshim:function(){ //display iframe shim function

	if (this.iframeshimadded){

		if (this.dropmenuobj.style.visibility=="visible"){

			this.shimobject.style.width=this.dropmenuobj.offsetWidth+"px"

			this.shimobject.style.height=this.dropmenuobj._trueheight+"px"

			this.shimobject.style.left=parseInt(this.dropmenuobj.style.left)+"px"

			this.shimobject.style.top=parseInt(this.dropmenuobj.style.top)+"px"

			this.shimobject.style.display="block"

		}

	}

},



hideshim:function(){

	if (this.iframeshimadded)

		this.shimobject.style.display='none'

},



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"

	this.hideshim()

},



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

				}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

	if (this.enableiframeshim && document.all && !window.XDomainRequest && !this.iframeshimadded){ //enable iframe shim in IE5.5 thru IE7?

		document.write('<IFRAME id="iframeshim" src="about:blank" frameBorder="0" scrolling="no" style="left:0; top:0; position:absolute; display:none;z-index:90; background: transparent;"></IFRAME>')

		this.shimobject=document.getElementById("iframeshim") //reference iframe object

		this.shimobject.style.filter='progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=0)'

		this.iframeshimadded=true

	}

} //end startchrome



}