//｡｡Macintosh           ｡｡->  MacOS
//｡｡Windows95/98/NT/2000  ->｡｡Windows
function getOSType()
{
    var uAgent  = navigator.userAgent.toUpperCase();
    if (uAgent.indexOf("MAC") >= 0) return "MacOS";
    if (uAgent.indexOf("WIN") >= 0) return "Windows";
    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;
}