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) {
		contact_about_over = newImage("../images/contact-about-over.png");
		contact_products_over = newImage("../images/contact-products-over.png");
		contact_services_over = newImage("../images/contact-services-over.png");
		corporate_over = newImage("../images/corporate-over.png");
		customerservice_over = newImage("../images/customerservice-over.png");
		sales_over = newImage("../images/sales-over.png");
		manufacturing_over = newImage("../images/manufacturing-over.png");
		preloadFlag = true;
	}
}