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) {
home_over = newImage("http://www.sintecs.nl/images/home-over.gif");
corporate_over = newImage("http://www.sintecs.nl/images/corporate-over.gif");
news_over = newImage("http://www.sintecs.nl/images/news-over.gif");
jobs_over = newImage("http://www.sintecs.nl/images/jobs-over.gif");
contacts_over = newImage("http://www.sintecs.nl/images/contacts-over.gif");
preloadFlag = true;}}