var preloadFlag = false;
  
 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];
 		}
 	}
 }
 
 function preloadImages() {
 	if (document.images) {
 		home_over = newImage("/images/home-over.jpg");
 		sitemap_over = newImage("/images/sitemap-over.jpg");
 		contact_over = newImage("/images/contact-over.jpg");
 		my_account_over = newImage("/images/my_account-over.jpg");
 		about_over = newImage("/images/about-over.jpg");
 		natural_gas_over = newImage("/images/natural_gas-over.jpg");
 		appliance_programs_over = newImage("/images/appliance_programs-over.jpg");
 		appliance_service_over = newImage("/images/appliance_service-over.jpg");
 		news_updates_over = newImage("/images/news_updates-over.jpg");
 		resource_centre_over = newImage("/images/resource_centre-over.jpg");
 		faq_over = newImage("/images/faq-over.jpg");
 		go_over = newImage("/images/go-over.jpg");
 		preloadFlag = true;
 	}
 }

preloadImages();