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) {
		menu_home_over = newImage("images/menu_home-over.jpg");
		menu_about_over = newImage("images/menu_about-over.jpg");
		menu_appointments_over = newImage("images/menu_appointments-over.jpg");
		menu_contact_over = newImage("images/menu_contact-over.jpg");
		menu_product_over = newImage("images/menu_product-over.jpg");
		menu_services_over = newImage("images/menu_services-over.jpg");
		menu_career_over = newImage("images/menu_career-over.jpg");
		menu_testimonials_over = newImage("images/menu_testimonials-over.jpg");
		preloadFlag = true;
	}
}