var url = "";
var w = 0;
var newWin = null;

function openFenster(url,breite,hoehe) {
    if (document.all && newWin != null) newWin.close(); // IE only
    if (url != null) {
        newWin =  window.open(url, "CVV2", "toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=-1,resizable=1,copyhistory=no,titlebar=no,WIDTH=" + breite + " HEIGHT=" + hoehe);
        newWin.focus();
    }
}