//ˇˇMacintosh           ˇˇ->  MacOS
//ˇˇWindows95/98/NT/2000  ->ˇˇWindows
function getOSType()
{
    var uAgent  = navigator.userAgent.toUpperCase();
    if (uAgent.indexOf("MAC") >= 0) return "MacOS";
    if (uAgent.indexOf("WIN") >= 0) return "Windows";
    return "";
}