// JavaScript Document
// global variables for timeout and for current menu
var t=false, current;
function setupMenu() {
	if(!document.getElementsByTagName)
		return;
	items = document.getElementsByTagName("li");
	for(i = 0; i < items.length; i++) {
		if(items[i].getAttribute("class") != "menu")
			continue;
		//set up the event handlers
		thelink=findChild(items[i],"A");
		thelink.onmouseover=ShowMenu;
		thelink.onmouseout=StartTimer;
		//is there a sub menu
		if(ul=findChild(items[i],"UL")){
			ul.style.display="none";
			for(j=0; j<ul.childNodes.length; j++){
				ul.childNodes[j].onmouseover=ResetTimer;
				ul.childNodes[j].onmouseout=StartTimer;
			}
		}
	}
};

//find the first child object of a particular type
function findChild(obj,tag){
	cn = obj.childNodes;
	for(k=0; k<cn.length; k++){
		if(cn[k].nodeName==tag)
			return cn[k];
	}
	return false;
};

function ShowMenu(e){
	if(!e)
		var e = window.event;
	//which link was the mouse over
	thislink = (e.target) ? e.target: e.srcElement;
	ResetTimer();
	//hide the previous mnu, if any
	if(current)
		HideMenu(current);
	// we want the LI, not the link
	thislink = thislink.parentNode;
	current = thislink;
	// find the submenu, if any
	ul = findChild(thislink, "UL");
	if(!ul)
		return;
	ul.style.display="block";
};

function HideMenu(thelink){
	//find the submenu, if any
	ul = findChild(thelink, "UL");
	if(!ul)
		return;
	ul.style.display="none";
};

function ResetTimer(){
	if(t)
		window.clearTimeout(t);
};

function StartTimer(){
	t = window.setTimeout("HideMenu(current)", 200);
};

function Main(){
	ajaxRequest("navigation.xml");
};

//Set up the menu when the page loads
window.onload=Main;