/***********************************************
* Modified Based On: 
* Simple Tree Menu- ? Dynamic Drive DHTML code library (www.dynamicdrive.com)
* This notice MUST stay intact for legal use
* Visit Dynamic Drive at http://www.dynamicdrive.com/ for full source code
************************************************
* Expanding menus - http://blogs.opml.org/isolani/2005/08/14
***********************************************/

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

ddtreemenu.closefolder="closed.gif"; //set image path to "closed" folder image
ddtreemenu.openfolder="open.gif"; //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.treeid = treeid;
	ddtreemenu.hlightPersistedKey = treeid+"_highlight";
	ddtreemenu.addHightLight(document.getElementById(treeid));
	if (ddtreemenu.getCookie(treeid+"_highlight") != "")
		ddtreemenu.hlightCurrent(document.getElementById(treeid), ddtreemenu.getCookie(treeid+"_highlight"));
	else
		ddtreemenu.hlightCurrentByUrl(document.getElementById(treeid));
}

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)
}

ddtreemenu.addHightLight=function(parentUlNode, parentIndexes) {
	if(parentUlNode) {
		var item = parentUlNode.firstChild;
		var curItem = 0;
		while(item) {
			// Look specifically for <li> nodes
			if (item.nodeName=="LI") {
				curItem ++;
				var indexes = (!parentIndexes || parentIndexes == "") ? curItem : (parentIndexes + "," + curItem);
				var linkEl = item.getElementsByTagName('a')[0];
				var childUlNodes = item.getElementsByTagName('ul');
				if(linkEl) {
					linkEl.setAttribute("parentindexes", indexes);
					if(childUlNodes.length==0 || (childUlNodes.length>0 && childUlNodes[0].getAttribute("rel") == "closed")) {
						linkEl.onclick = function() {
							ddtreemenu.setCookie(ddtreemenu.hlightPersistedKey, this.getAttribute("parentindexes"));
							if(ddtreemenu.removeanchorhash(document.location.href, document.location.hash) == ddtreemenu.removeanchorhash(linkEl.href, linkEl.hash)) {
								ddtreemenu.hlightCurrent(document.getElementById(ddtreemenu.treeid), this.getAttribute("parentindexes"));
							}
						}
					}
				}
				if (childUlNodes.length > 0) {
					ddtreemenu.addHightLight(childUlNodes[0], indexes);
				}
			}
			// Move to the next child, and repeat
			item = item.nextSibling;
		}
	}
}

ddtreemenu.hlightCurrent=function(parentUlNode, hlightIndexes) {
	hlightIndexes = hlightIndexes.replace(/\s*/gi, "");
	if(parentUlNode && hlightIndexes != "") {
		var item = parentUlNode.firstChild;
		var curItem = 0;
		var indexes = hlightIndexes.split(",");
		while(item) {
			// Look specifically for <li> nodes
			if (item.nodeName=="LI") {
				curItem ++;
				if(indexes[0] == curItem) {
					item.className = item.className + " selected";
					if (item.getElementsByTagName('ul').length && indexes.length>1) {
						ddtreemenu.hlightCurrent(item.getElementsByTagName('ul')[0], hlightIndexes.substr((curItem + "").length + 1));
					}
				}
				else {
					item.className = item.className.replace(" selected", "");
				}
			}
			// Move to the next child, and repeat
			item = item.nextSibling;
		}
	}
}

ddtreemenu.hlightCurrentByUrl=function(parentUlNode) {
	if(parentUlNode) {
		var item = parentUlNode.firstChild;
		while(item) {
			// Look specifically for <li> nodes
			if (item.nodeName=="LI") {
				var links = item.getElementsByTagName('a');
				var blnSelected = false;
				for(var i=0; i<links.length; i++)
				{
					if(document.location == links[i].href) {
						blnSelected = true;
						break;
					}
				}
				if(blnSelected)
					item.className = item.className + " selected";
				else
					item.className = item.className.replace(" selected", "");
			}
			// Move to the next child, and repeat
			item = item.nextSibling;
		}
	}
}

////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
	if(days == null) 
		document.cookie = name+"="+value+"; path=/";
	else
	{
		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);
}

ddtreemenu.removeanchorhash=function(href, hash) {
	var re=new RegExp(hash+"$", "i");
	return href.replace(re, "");
}