function popUp(src, extra, taal){
    var url = "/web/thumbnail.php?taal="+taal+"&image="+src+"&width=" +screen.width + "&height="+ screen.height + "&extra=" + escape(extra);
    var win = open(url,"","width=0,height=0,top=0,left=0,status=0");
    win.focus();
    // win.blur();
}