// ===================================================================
// 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);
		}
	}
}