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

ddtreemenu.closefolder="sclose.jpg" 
ddtreemenu.openfolder="sopen.jpg" 

ddtreemenu.createTree = function(treeid, enablepersist, persistdays)
{
	var ultags=document.getElementById(treeid).getElementsByTagName("ul")
	if (typeof persisteduls[treeid] == "undefined")
		persisteduls[treeid]= "";
	
	for (var i=0; i<ultags.length; i++)
		ddtreemenu.buildSubTree(treeid, ultags[i], i)
	/*
	if (enablepersist == true)
	{
		var durationdays = (typeof persistdays == "undefined") ? 1 : parseInt(persistdays)
		ddtreemenu.dotask(window, function(){ddtreemenu.rememberstate(treeid, durationdays)}, "unload")
	}
	*/
}

ddtreemenu.buildSubTree = function(treeid, ulelement, index)
{
	ulelement.parentNode.className="submenu"

	if (typeof persisteduls[treeid]=="object"){
		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")
	}
	else if (ulelement.getAttribute("rel") == null || ulelement.getAttribute("rel") == false)
		ulelement.setAttribute("rel", "closed")
	else if (ulelement.getAttribute("rel") == "open")
		ddtreemenu.expandSubTree(treeid, ulelement)

	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)
{ 
	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")
		{
			currentnode.style.display="block"
			currentnode.setAttribute("rel", "open")
			currentnode.parentNode.style.backgroundImage = "url("+ddtreemenu.openfolder+")"
		}

		currentnode = currentnode.parentNode
	}
}

ddtreemenu.flatten = function(treeid, action)
{ 
	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)
{ 
	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 
	}
	if (openuls.length==0) 
		openuls[0]="none open" 
	ddtreemenu.setCookie(treeid, openuls.join(","), durationdays)
}

ddtreemenu.getCookie = function(Name)
{
	var re=new RegExp(Name+"=[^;]+", "i"); 
	
	if (document.cookie.match(re)) 
		return document.cookie.match(re)[0].split("=")[1] 
	
	return ""
}

ddtreemenu.setCookie = function(name, value, days){ 
	var expireDate = new Date()
	
	var expstring=expireDate.setDate(expireDate.getDate()+parseInt(days))
		document.cookie = name+"="+value+"; expires="+expireDate.toGMTString()+"; path=/";
}

ddtreemenu.searcharray = function(thearray, value)
{ 
	var isfound=false
	for (var i=0; i<thearray.length; i++)
	{
		if (thearray[i]==value)
		{
			isfound=true
			thearray.shift() 
			break
		}
	}
	return isfound
}

ddtreemenu.preventpropagate = function(e)
{ 
	if (typeof e!="undefined")
		e.stopPropagation()
	else
		event.cancelBubble=true
}

ddtreemenu.dotask = function(target, functionref, tasktype)
{
	var tasktype=(window.addEventListener)? tasktype : "on"+tasktype
	if (target.addEventListener)
		target.addEventListener(tasktype, functionref, false)
	else if (target.attachEvent)
		target.attachEvent(tasktype, functionref)
}