//　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;
}

var cssDir = 'css/';
var cssTags = '<link rel="stylesheet" type="text/css" href="';
os      = getOSType();
browser = getBrowserName();
version = getBrowserVersion();
if (os == "MacOS")   dirName = "mac/";
if (os == "Windows") dirName = "win/";
if (browser == "Netscape") dirName += "ns";
if (browser == "Explorer") dirName += "ie";
if ((version >= 3) && (version < 5)) dirName += "4";
if ((version >= 5) && (version < 6)) dirName += "5";
if ((version >= 6) && (version < 7))   dirName += "6";
if ((version >= 7) && (version < 8))   dirName += "7";
if ((version >= 8) && (version < 9))   dirName += "8";
if ((version >= 9) && (version < 10))  dirName += "9";
document.write(cssTags+cssDir+dirName+'.css">');