function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		var pizza = newImage("images/pizzanav.jpg");
		var entiremenu = newImage("images/entiremenunav.jpg");
		var couponsnav = newImage("images/couponsnav.jpg");
		var findastorenav = newImage("images/findastorenavnav.jpg");
		
		var pizzaover = newImage("images/pizzanavover.jpg");
		var entiremenuover = newImage("images/entiremenunavover.jpg");
		var couponsnavover = newImage("images/couponsnavover.jpg");
		var findastorenavover = newImage("images/findastorenavnavover.jpg");
		
		preloadFlag = true;
	}
}