// ===================================================================
// Author: Matt Kruse <matt@mattkruse.com>
// WWW: http://www.mattkruse.com/
//
// NOTICE: You may use this code for any purpose, commercial or
// private, without any further permission from the author. You may
// remove this notice from your final code if you wish, however it is
// appreciated by the author if at least my web site address is kept.
//
// You may *NOT* re-distribute this code in any way except through its
// use. That means, you can include it in your product, or your web
// site, or any other form where the code is actually being used. You
// may not put the plain javascript up on your site for download or
// include it in your javascript libraries for download. 
// If you wish to share this code with others, please just point them
// to the URL instead.
// Please DO NOT link directly to my .js files from your site. Copy
// the files to your server and use them there. Thank you.
// ===================================================================

addEvent(window,"load",convertTrees);

function addEvent(o,e,f)
{
	if (o.addEventListener) {
		o.addEventListener(e,f,true);
		return true;
	} else if (o.attachEvent) {
		return o.attachEvent("on"+e,f);
	} else{ 
		return false;
	}
}

function setDefault(name,val)
{
	if (typeof(window[name])=="undefined" || window[name] == null) {
		window[name]=val;
	}
}

function expandTree(treeId) { 
	var ul = document.getElementById(treeId); 
	if (ul == null) { 
		return false;
	} 
	expandCollapseList(ul,nodeOpenClass); 
}

function collapseTree(treeId) { 
	var ul = document.getElementById(treeId); 
	if (ul == null) { 
		return false; 
	}  
	expandCollapseList(ul,nodeClosedClass); 
} 

function expandToItem(treeId,itemId) 
{ 
	var ul = document.getElementById(treeId); 
	if(ul == null){ 
		return false; 
	}
	var ret = expandCollapseList(ul,nodeOpenClass,itemId); 
	if(ret){ 
		var o = document.getElementById(itemId); 
		if(o.scrollIntoView){ 
			o.scrollIntoView(false);
		}
	}
}

function expandCollapseList(ul,cName,itemId)
{
	if(!ul.childNodes || ul.childNodes.length==0){
		return false;
	}
	for(var itemi=0;itemi<ul.childNodes.length;itemi++){
		var item = ul.childNodes[itemi];
		if(itemId!=null && item.id==itemId){
			return true;
		}
		if(item.nodeName == "LI"){
			var subLists = false;
			for(var sitemi=0;sitemi<item.childNodes.length;sitemi++){
				var sitem = item.childNodes[sitemi];
				if(sitem.nodeName=="UL"){
					subLists = true;
					var ret = expandCollapseList(sitem,cName,itemId);
					if(itemId!=null && ret){
						item.className=cName;
						return true;
					}
				}
			}
			if(subLists && itemId==null){
				item.className = cName;
			}
		}
	}
}

function convertTrees()
{
	setDefault("treeClass","mktree");
	setDefault("nodeClosedClass","liClosed");
	setDefault("nodeOpenClass","liOpen");
	setDefault("nodeBulletClass","liBullet");
	setDefault("nodeLinkClass","bullet");
	setDefault("preProcessTrees",true);
	if(preProcessTrees){
		if(!document.createElement){
			return;
		}
		uls = document.getElementsByTagName("ul");
		for(var uli=0;uli<uls.length;uli++){
			var ul=uls[uli];
			if(ul.nodeName=="UL" && ul.className==treeClass){
				processList(ul);
			}
		}
	}
}

function processList(ul){
	if(!ul.childNodes || ul.childNodes.length==0){
		return;
	}
	for(var itemi=0;itemi<ul.childNodes.length;itemi++){
		var item = ul.childNodes[itemi];
		if(item.nodeName == "LI"){
			var subLists = false;
			for(var sitemi=0;sitemi<item.childNodes.length;sitemi++){
				var sitem = item.childNodes[sitemi];
				if(sitem.nodeName=="UL"){
					subLists = true;
					processList(sitem);
				}
			}
			var s= document.createElement("SPAN");
			var t= '\u00A0';
			s.className = nodeLinkClass;
			if(subLists){
				if(item.className==null || item.className==""){
					item.className = nodeClosedClass;
				}
				if(item.firstChild.nodeName=="#text"){
					t = t+item.firstChild.nodeValue;
					item.removeChild(item.firstChild);
				}
				s.onclick = function(){
					this.parentNode.className =(this.parentNode.className==nodeOpenClass) ? nodeClosedClass : nodeOpenClass;
					return false;
				}
			} else {
				item.className = nodeBulletClass;
				s.onclick = function(){
					return false;
				}
			}
			s.appendChild(document.createTextNode(t));
			item.insertBefore(s,item.firstChild);
		}
	}
}