function isUndefined(v) {
    var undef;
    return v===undef;
}

function rawPopup(url, target, features) {
    if (isUndefined(target)) {
        target = '_blank';
    }

    var newWindow = window.open(url, target, features);
    newWindow.focus();
    return newWindow;
}

function linkPopup(src, features) {
    return rawPopup(src.getAttribute('href'), src.getAttribute('target') || '_blank', features);
}

function PopupPic(sPicURL) { 
     window.open("../popup/preview.aspx?vorschaudatei="+sPicURL, "","resizable=1,HEIGHT=332,WIDTH=500");
   } 

function MM_openBrWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}