function open_popup(ip) 
{
    var ha = 460;
    var la = 520;
    var top = Math.round((screen.availHeight - ha) / 2);
    var left = Math.round((screen.availWidth - la) / 2);
    window.open("http://webcallback.axialys.net/popup.php?ip=" + ip, null, "width=" + la + ", height=" + ha + ", top=" + top + ", left=" + left + ", status=no, resizable=no, toolbar=no, menubar=no, scrollbars=no")
}