var zufall = Math.round((Math.random() * 1000000));
function zoom(datei,breit,hoch) {
    bigInv = window.open(datei, "Inv" +zufall, "width=" +breit+ ",height=" +hoch+ ",resizable=no,menubar=no,status=no,locationbar=no,dependent=yes,scrollbars=no");
    bigInv.focus(); 
}