function popup (title, id, p) {
    window.open ('http://www.meetingpoint.org/popup.php?titel='+title+'&id='+id+'&'+p, 'venster', 'scrollbars=no, status=no, width=640, height=480, left='+(screen.width/2-320)+', top='+(screen.height/2-240));
}

function popupPreek (title, id, p) {
    window.open ('http://www.meetingpoint.org/popup_preek.php?titel='+title+'&id='+id+'&p='+p, 'venster', 'scrollbars=no, status=no, width=640, height=480, left='+(screen.width/2-320)+', top='+(screen.height/2-240));
}