function setHandlers()
{
	if (!document.getElementById || !document.getElementsByTagName) return false;
	if (!document.getElementById("navigation")) return false;

	var imgs = document.getElementById("navigation").getElementsByTagName("img");
	for (var i = 0; i < imgs.length; i++)
	{
		imgs[i].onmouseover = handleMouseover;
		imgs[i].onmouseout = handleMouseout;
	}
}

function handleMouseover()
{
	var o = this;
	o.src = "http://www.uta.edu/sustainability/images/homenav/" + o.id + "-over.jpg";
}

function handleMouseout()
{
	var o = this;
	o.src = "http://www.uta.edu/sustainability/images/homenav/" + o.id + ".jpg";
}

window.onload = setHandlers;