function popup (url) {
	l = (screen.width - 635) / 2;
	t = (screen.height - 315) / 2;
	wnd = window.open (url, "bezettingPopup", "left="+l+",top="+t+",width=635,height=315,location=no,menubar=no,status=no");	
}

function popupPrijzen (url) {
	l = (screen.width - 635) / 2;
	t = (screen.height - 500) / 2;
	wnd = window.open (url, "bezettingPopup", "left="+l+",top="+t+",width=635,height=500,location=no,menubar=no,status=no,scrollbars=yes");	
}