//　Macintosh           　->  MacOS
//　Windows95/98/NT/2000  ->　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
function getBrowserName()
{
   var aName  = navigator.appName.toUpperCase();
   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;
    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;
}