//　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;
}


function select_css(dname){

	os      = getOSType();
	browser = getBrowserName();
	version = getBrowserVersion();
	
	// ベースディレクトリ
	// 環境に合わせて修正してください。
	dirName = dname;
	
	if (os == "MacOS")   dirName += "mac_";
	if (os == "Windows") dirName += "win_";
	if (os == "UNIX")    dirName += "unix_";
	if (browser == "Netscape") dirName += 'nn';
	if (browser == "Explorer") dirName += 'ie';
	
	dirName += ".css";

	document.write("<link rel='stylesheet' href='" + dirName + "' type='text/css'>");
	
}