var preloadedImages = new Array();

function preloadImages(locationFolder) {
	if(document.images) {
			var i, args = preloadImages.arguments; 
			for(i=1; i<args.length; i++) {
				preloadedImages[args[i]]   = new Image(); 
				preloadedImages[args[i]].src   = locationFolder + args[i];
			}
	}
}

function rollOn(imageName) {
	if(document.images)
		document.images[imageName].src = preloadedImages[imageName + "_over.gif"].src;
}
function rollOff(imageName) {
	if(document.images)
		document.images[imageName].src = preloadedImages[imageName + ".gif"].src;
}

	
preloadImages('/upload/images/', 'company_menu.gif', 'company_menu_over.gif', 'prod_menu.gif', 'prod_menu_over.gif', 'fb_menu.gif', 'fb_menu_over.gif', 'n_home.gif', 'n_home_over.gif', 'n_mail.gif', 'n_mail_over.gif', 'n_search.gif', 'n_search_over.gif', 'n_home_d.gif', 'n_home_d_over.gif', 'n_mail_d.gif', 'n_mail_d_over.gif', 'n_search_d.gif', 'n_search_d_over.gif');