//** 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





var cssdropdown={

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

dropdownindicator: '<img src="down.gif" border="0" />', //specify full HTML to add to end of each menu item with a drop down menu

enableswipe: 1, //enable swipe effect? 1 for yes, 0 for no

enableiframeshim: 1, //enable "iframe shim" in IE5.5/IE6? (1=yes, 0=no)



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



dropmenuobj: null, asscmenuitem: null, domsupport: document.all || document.getElementById, standardbody: null, iframeshimadded: false, swipetimer: undefined, bottomclip:0,



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;

},



swipeeffect:function(){

	if (this.bottomclip<parseInt(this.dropmenuobj.offsetHeight)){

		this.bottomclip+=10+(this.bottomclip/10) //unclip drop down menu visibility gradually

		this.dropmenuobj.style.clip="rect(0 auto "+this.bottomclip+"px 0)"

	}

	else

		return

	this.swipetimer=setTimeout("cssdropdown.swipeeffect()", 10)

},



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

},



showhide:function(obj, e){

	this.dropmenuobj.style.left=this.dropmenuobj.style.top="-500px"

	if (this.enableswipe==1){

		if (typeof this.swipetimer!="undefined")

			clearTimeout(this.swipetimer)

		obj.clip="rect(0 auto 0 0)" //hide menu via clipping

		this.bottomclip=0

		this.swipeeffect()

	}

	obj.visibility="visible"

	this.css(this.asscmenuitem, "selected", "add")

},



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

		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=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

		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

		}

	}

	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.showhide(this.dropmenuobj.style, 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.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'

},



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=0

	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+" "+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

	if (window.createPopup && !window.XmlHttpRequest &&!this.iframeshimadded){ //if IE5.5 to IE6, create iframe for iframe shim technique

		document.write('<IFRAME id="iframeshim"  src="" style="display: none; left: 0; top: 0; z-index: 90; position: absolute; filter: progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=0)" frameBorder="0" scrolling="no"></IFRAME>')

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

		this.iframeshimadded=true

	}

} //end startchrome



}