var W3CDOM = (document.createElement && document.getElementsByTagName);

var mouseOvers = new Array();
var mouseOuts = new Array();

window.onload = init;

function init()
{
	if (!W3CDOM) return;
	var nav = document.getElementById('nav');
	var imgs = nav.getElementsByTagName('img');
	for (var i=0;i<imgs.length;i++)
	{
        if (imgs[i].alt != 'menu_divider') {
            imgs[i].onmouseover = mouseGoesOver;
            imgs[i].onmouseout = mouseGoesOut;
            var suffix = imgs[i].src.substring(imgs[i].src.lastIndexOf('.'));
            mouseOuts[i] = new Image();
            mouseOuts[i].src = imgs[i].src;
            mouseOvers[i] = new Image();
            mouseOvers[i].src = imgs[i].src.substring(0,imgs[i].src.lastIndexOf('.')) + "_on" + suffix;
            imgs[i].number = i;
        }              
	}
}

function mouseGoesOver()
{
	this.src = mouseOvers[this.number].src;
}

function mouseGoesOut()
{
	this.src = mouseOuts[this.number].src;
}