var persisteduls=new Object()
var ddtreemenu=new Object()

/*
ddtreemenu.closefolder="closed.gif" //set image path to "closed" folder image
ddtreemenu.openfolder="open.gif" //set image path to "open" folder image
*/
ddtreemenu.closefolder="" //set image path to "closed" folder image
ddtreemenu.openfolder="" //set image path to "open" folder image

//////////No need to edit beyond here///////////////////////////
ddtreemenu.createTree=function(treeid, enablepersist, CloseId, OpenId)
{
	ddtreemenu.closefolder=CloseId; //set image path to "closed" folder image
	ddtreemenu.openfolder=OpenId; //set image path to "open" folder image

	var ultags=document.getElementById(treeid).getElementsByTagName("ul")
	
	if (typeof persisteduls[treeid]=="undefined")
		persisteduls[treeid]=(enablepersist==true && ddtreemenu.getCookie(treeid)!="")? ddtreemenu.getCookie(treeid).split(",") : ""
	
	for (var i=0; i<ultags.length; i++)
		ddtreemenu.buildSubTree(treeid, ultags[i], i)
	
	if (enablepersist==true)
	{ 
		//if enable persist feature
		var durationdays=1
		ddtreemenu.dotask(window, function(){ddtreemenu.rememberstate(treeid, durationdays)}, "unload") //save opened UL indexes on body unload
	}
}

ddtreemenu.buildSubTree=function(treeid, ulelement, index)
{
	ulelement.parentNode.className="submenu"
	if (typeof persisteduls[treeid]=="object")
	{ 
		//if cookie exists (persisteduls[treeid] is an array versus "" string)
		if (ddtreemenu.searcharray(persisteduls[treeid], index))
		{
			ulelement.setAttribute("rel", "open")
			ulelement.style.display="block"
			ulelement.parentNode.style.backgroundImage="url("+ddtreemenu.openfolder+")"
		}
		else
			ulelement.setAttribute("rel", "closed")
	} //end cookie persist code
	else 
		if (ulelement.getAttribute("rel")==null || ulelement.getAttribute("rel")==false) //if no cookie and UL has NO rel attribute explicted added by user
			ulelement.setAttribute("rel", "closed")			
		else 
			if (ulelement.getAttribute("rel")=="open") //else if no cookie and this UL has an explicit rel value of "open"
			
	ddtreemenu.expandSubTree(treeid, ulelement) //expand this UL plus all parent ULs (so the most inner UL is revealed!)
	
	ulelement.parentNode.onclick=function(e)
	{
		var submenu=this.getElementsByTagName("ul")[0]
		if (submenu.getAttribute("rel")=="closed"){
			submenu.style.display="block"
			submenu.setAttribute("rel", "open")
			ulelement.parentNode.style.backgroundImage="url("+ddtreemenu.openfolder+")"
		}
		else if (submenu.getAttribute("rel")=="open")
		{
			submenu.style.display="none"
			submenu.setAttribute("rel", "closed")
			ulelement.parentNode.style.backgroundImage="url("+ddtreemenu.closefolder+")"
		}
		ddtreemenu.preventpropagate(e)
	}

	ulelement.onclick=function(e)
	{
		ddtreemenu.preventpropagate(e)
	}
}

ddtreemenu.expandSubTree=function(treeid, ulelement)
{ 
	//expand a UL element and any of its parent ULs
	var rootnode=document.getElementById(treeid)
	var currentnode=ulelement
	currentnode.style.display="block"
	currentnode.parentNode.style.backgroundImage="url("+ddtreemenu.openfolder+")"
	
	while (currentnode!=rootnode)
	{
		if (currentnode.tagName=="UL")
		{ //if parent node is a UL, expand it too
			currentnode.style.display="block"
			currentnode.setAttribute("rel", "open") //indicate it's open
			currentnode.parentNode.style.backgroundImage="url("+ddtreemenu.openfolder+")"
		}
		currentnode=currentnode.parentNode
	}
}

ddtreemenu.flatten=function(treeid, action)
{ //expand or contract all UL elements
	var ultags=document.getElementById(treeid).getElementsByTagName("ul")
	for (var i=0; i<ultags.length; i++)
	{
		ultags[i].style.display=(action=="expand")? "block" : "none"
		var relvalue=(action=="expand")? "open" : "closed"
		ultags[i].setAttribute("rel", relvalue)
		ultags[i].parentNode.style.backgroundImage=(action=="expand")? "url("+ddtreemenu.openfolder+")" : "url("+ddtreemenu.closefolder+")"
	}
}

ddtreemenu.rememberstate=function(treeid, durationdays)
{ 
	//store index of opened ULs relative to other ULs in Tree into cookie
	var ultags=document.getElementById(treeid).getElementsByTagName("ul")
	var openuls=new Array()

	for (var i=0; i<ultags.length; i++)
	{
		if (ultags[i].getAttribute("rel")=="open")
			openuls[openuls.length]=i //save the index of the opened UL (relative to the entire list of ULs) as an array element
	}
	
	if (openuls.length==0) //if there are no opened ULs to save/persist
		openuls[0]="none open" //set array value to string to simply indicate all ULs should persist with state being closed
		
	ddtreemenu.setCookie(treeid, openuls.join(","), durationdays) //populate cookie with value treeid=1,2,3 etc (where 1,2... are the indexes of the opened ULs)
}

////A few utility functions below//////////////////////

ddtreemenu.getCookie=function(Name){ //get cookie value
var re=new RegExp(Name+"=[^;]+", "i"); //construct RE to search for target name/value pair
if (document.cookie.match(re)) //if cookie found
return document.cookie.match(re)[0].split("=")[1] //return its value
return ""
}

ddtreemenu.setCookie=function(name, value, days){ //set cookei value
var expireDate = new Date()
//set "expstring" to either future or past date, to set or delete cookie, respectively
var expstring=expireDate.setDate(expireDate.getDate()+parseInt(days))
document.cookie = name+"="+value+"; expires="+expireDate.toGMTString()+"; path=/";
}

ddtreemenu.searcharray=function(thearray, value){ //searches an array for the entered value. If found, delete value from array
var isfound=false
for (var i=0; i<thearray.length; i++){
if (thearray[i]==value){
isfound=true
thearray.shift() //delete this element from array for efficiency sake
break
}
}
return isfound
}

ddtreemenu.preventpropagate=function(e){ //prevent action from bubbling upwards
if (typeof e!="undefined")
e.stopPropagation()
else
event.cancelBubble=true
}

ddtreemenu.dotask=function(target, functionref, tasktype){ //assign a function to execute to an event handler (ie: onunload)
var tasktype=(window.addEventListener)? tasktype : "on"+tasktype
if (target.addEventListener)
target.addEventListener(tasktype, functionref, false)
else if (target.attachEvent)
target.attachEvent(tasktype, functionref)
}