//　Macintosh           　->  MacOS
//　Windows95/98/NT/2000/XP  ->　Windows
//　UNIX                  ->　UNIX
function getOSType()
{
    var uAgent  = navigator.userAgent.toUpperCase();
    if (uAgent.indexOf("MAC") >= 0) return "MacOS";
    if (uAgent.indexOf("WIN") >= 0) return "Windows";
    if (uAgent.indexOf("X11") >= 0) return "UNIX";
    return "";
}
//　Netscape Navigator ->  Netscape
//　Internet Explorer  ->　Explorer
//　Safari  ->　Safari
//　Opera  ->　Opera
function getBrowserName()
{
    var aName  = navigator.appName.toUpperCase();
    var uName = navigator.userAgent.toUpperCase();
    if (uName.indexOf("SAFARI") >= 0)  return "Safari";
    if (uName.indexOf("OPERA") >= 0)  return "Opera";
    if (aName.indexOf("NETSCAPE") >= 0)  return "Netscape";
    if (aName.indexOf("MICROSOFT") >= 0) return "Explorer";
    return "";
}
function getBrowserVersion()
{
        var browser = getBrowserName();
        var version = 0;
        var s = 0;
        var e = 0;
        var appVer  = navigator.appVersion;
        var uName  = navigator.userAgent.toUpperCase();
        if (browser == "Safari")
        {
                version = eval(appVer.substring(0,3)) - 4;
        }
        if (browser == "Opera")
        {
                s = uName.indexOf("OPERA ",0) + 6;
                e = uName.indexOf(" ",s);
                version = eval(uName.substring(s,e));
        }
        if (browser == "Netscape")
        {
                s = appVer.indexOf(" ",0);
                version = eval(appVer.substring(0,s));
                if (version >= 5) version++;
        }
        if (browser == "Explorer")
        {
                appVer  = navigator.userAgent;
                s = appVer.indexOf("MSIE ",0) + 5;
                e = appVer.indexOf(";",s);
                version = eval(appVer.substring(s,e));
        }
        return version;
}