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) {
corporate_over = newImage("images/corporate-over.jpg");
contacts_over = newImage("images/contacts-over.jpg");
news_over = newImage("images/news-over.jpg");
search_over = newImage("images/search-over.jpg");
products_over = newImage("images/products-over.jpg");
services_over = newImage("images/services-over.jpg");
training_over = newImage("images/training-over.jpg");
support_over = newImage("images/support-over.jpg");
preloadFlag = true;}}