//　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;
}