var lastDiv = null;
var lastTimer = null;

function enterheader(id)
{
	exitmenu();
	lastDiv = document.getElementById(id);
	if (lastDiv != null)
		lastDiv.style.display = 'block';
}


function exitmenu()
{
	cleartimer();
	if (lastDiv != null)
		lastDiv.style.display = 'none';
	lastDiv = null;
}

function cleartimer()
{
	if (lastTimer != null)
	{
		clearTimeout(lastTimer);
		lastTimer = null;
	}
}

function delayedclose()
{
	cleartimer();
	lastTimer = setTimeout("exitmenu()", 200);
}

/*
	Standards Compliant Rollover Script
	Author : Daniel Nolan
	http://www.bleedingego.co.uk/webdev.php
*/

function initRollovers() {
	if (!document.getElementById) return
	
	var aPreLoad = new Array();
	var sTempSrc;
	var aImages = document.getElementsByTagName('img');

	for (var i = 0; i < aImages.length; i++) {		
		if (aImages[i].className == 'imgover') {
			var src = aImages[i].getAttribute('src');
			var ftype = src.substring(src.lastIndexOf('.'), src.length);
			var hsrc = src.replace(ftype, '_o'+ftype);

			aImages[i].setAttribute('hsrc', hsrc);
			
			aPreLoad[i] = new Image();
			aPreLoad[i].src = hsrc;
			
			aImages[i].onmouseover = function() {
				sTempSrc = this.getAttribute('src');
				this.setAttribute('src', this.getAttribute('hsrc'));
				enterheader(this.getAttribute('dropdowndiv'));
			}	
			
			aImages[i].onmouseout = function(event) {
				if (!sTempSrc) sTempSrc = this.getAttribute('src').replace('_o'+ftype, ftype);
				this.setAttribute('src', sTempSrc);
				delayedclose();
			}
		}
	}
}

window.onload = initRollovers;