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

ddtreemenu.closefolder = "images/purplearrow.png" // set image path to "closed" folder image
ddtreemenu.openfolder = "images/purplearrow2.png" // set image path to "open" folder image

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

ddtreemenu.createTree = function(treeid, enablepersist, persistdays)
{
	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 = (typeof persistdays == "undefined") ? 1
		  : parseInt(persistdays)
		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)
}