parent.document.body.style.backgroundImage='url(http://www.wyodor.net/postkantoor/images/Paginavulling.png)';
parent.document.body.style.backgroundRepeat='repeat-x';
parent.document.body.style.backgroundAttachment='fixed';

elem = parent.document.getElementById('nav_layer');
elem.style.backgroundImage='url(http://www.wyodor.net/postkantoor/images/Paginavulling.png)';
elem.style.backgroundRepeat='repeat-x';
elem.style.position='fixed';
elem.style.zIndex='100';

elem = parent.document.getElementById('body_layer');

elem.style.marginTop='100px';