function whois(url) {
    var windowName = "popup";
    var features =
        'width='        + '600' +
        ',height='      + '600' +
        ',directories=' + '0' +
        ',location='    + '1' +
        ',menubar='     + '0' +
        ',scrollbars='  + '1' +
        ',status='      + '0' +
        ',toolbar='     + '0' +
        ',resizable='   + '1';

    window.open (url, windowName, features);
}