//** 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: '', //add mnualy!! .. 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
}