homeOn = new Image();
homeOn.src = "on/home.gif";

aboutOn = new Image();
aboutOn.src = "on/about.gif";

whyOn = new Image();
whyOn.src = "on/why.gif";

contactOn = new Image();
contactOn.src = "on/contact.gif";

function imgOn(imgName) {
	document [imgName].src = eval((imgName) + "On.src");
}
function imgOff(imgName) {
	document [imgName].src = "off/" + (imgName) + ".gif";
}