//　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;

}