if (document.images) {
	productsoff = new Image (0,0);
	careersoff = new Image (0,0);
	purchaseoff = new Image (0,0);
	aboutoff = new Image (0,0);
	contactoff = new Image (0,0);
	
	productson = new Image (0,0);
	careerson = new Image (0,0);
	purchaseon = new Image (0,0);
	abouton = new Image (0,0);
	contacton = new Image (0,0);

	productsoff.src = "images/products_off.gif";
	careersoff.src = "images/careers_off.gif";
	purchaseoff.src = "images/purchase_off.gif";
	aboutoff.src = "images/about_off.gif";
	contactoff.src = "images/contact_off.gif";

	productson.src = "images/products_on.gif";
	careerson.src = "images/careers_on.gif";
	purchaseon.src = "images/purchase_on.gif";
	abouton.src = "images/about_on.gif";
	contacton.src = "images/contact_on.gif";
	
}

function act(imgName) {

	if (document.images) {
		document[imgName].src = eval(imgName + 'on.src');
	}
   
}

function inact(imgName) {

	if (document.images) {
		document[imgName].src = eval(imgName + 'off.src');
	}
   
}