function PopUp(popupURL) {
    window.open(popupURL,"popupwindow","toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=yes,resizable=yes,width=400,height=300,screenX=300,screenY=300");
}

// <script>emaillink('beispieldomain.tld','info');</script>
function emaillink(suffix, prefix) {
    var l = prefix + '@' + suffix;
    var p = '<a href="' + 'mai' + 'lto:' + l + '">';
    var p2 = '</a>';
    document.write(p + l + p2);
}