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) {
		home_over = newImage("images/buttons/home-over.gif");
		home_Trailer_over = newImage("images/buttons/home-Trailer_over.gif");
		Trailer_over = newImage("images/buttons/Trailer-over.gif");
		Trailer_Service_over = newImage("images/buttons/Trailer-Service_over.gif");
		Service_over = newImage("images/buttons/Service-over.gif");
		Service_About_over = newImage("images/buttons/Service-About_over.gif");
		About_over = newImage("images/buttons/About-over.gif");
		About_Contact_over = newImage("images/buttons/About-Contact_over.gif");
		Contact_home_over = newImage("images/buttons/Contact-home_over.gif");
		Contact_over = newImage("images/buttons/Contact-over.gif");
		preloadFlag = true;
	}
}