if (document.images) {
image1on = new Image();
image1on.src = "http://www.event-creators.nl/images/tab_bedrijfsuitjes_over.jpg";
image1off = new Image();
image1off.src = "http://www.event-creators.nl/images/tab_bedrijfsuitjes_uit.jpg";
image2on = new Image();
image2on.src = "http://www.event-creators.nl/images/tab_businessevents_over.jpg";
image2off = new Image();
image2off.src = "http://www.event-creators.nl/images/tab_businessevents_uit.jpg";
image3on = new Image();
image3on.src = "http://www.event-creators.nl/images/tab_personeelsreizen_over.jpg";
image3off = new Image();
image3off.src = "http://www.event-creators.nl/images/tab_personeelsreizen_uit.jpg";
image4on = new Image();
image4on.src = "http://www.event-creators.nl/images/tab_demethoeve_over.jpg";
image4off = new Image();
image4off.src = "http://www.event-creators.nl/images/tab_demethoeve_uit.jpg";
} 
function changeImages() {
if (document.images) {
for (var i=0; i<changeImages.arguments.length; i+=2) {
document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
}}}