//
//　OS (Operating System)チェック
//　　　　種　　　類　　　：　　戻　り　値
//　Macintosh           　->  MacOS
//　Windows95/98/NT/2000/XP  ->　Windows
//　UNIX                  ->　UNIX
//　上記以外の場合は何も値を返しません
//
function getOSType()
{
    var RetCode = "";
    var uAgent  = navigator.userAgent.toUpperCase();
    if (uAgent.indexOf("MAC") >= 0)           RetCode = "MacOS";
    if (uAgent.indexOf("WIN") >= 0)           RetCode = "Windows";
    if (uAgent.indexOf("X11") >= 0)           RetCode = "UNIX";
    return RetCode;
}

//
//　ブラウザチェック
//　　　　種　　　類　　　：　　戻　り　値
//　Netscape Navigator ->  Netscape
//　Internet Explorer  ->　Explorer
//　上記以外の場合は何も値を返しません
//
function getBrowserName()
{
    var aName  = navigator.appName.toUpperCase();
    var uName  = navigator.userAgent.toUpperCase();
    if (aName.indexOf("NETSCAPE") >= 0)       return "Netscape";
    if (aName.indexOf("MICROSOFT") >= 0)      return "Explorer";
	if (aName.indexOf("FIREFOX") >= 0)      return "FIREFOX";
    return "";
}

//
//　ブラウザバージョン取得
//
function getBrowserVersion()
{
	var browser = getBrowserName();
	var version = 0;
	var s = 0;
	var e = 0;
	var appVer  = navigator.appVersion;
	if (browser == "Firefox")
	{
		s = appVer.indexOf(" ",0);
		version = eval(appVer.substring(0,s));
		if (version >= 5) version++;
	}
		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));

		version = appVer.substring(s,e);
		if(version.charAt(0) == 6) version = "6";
		version = eval(version);
	}
	return version;
}

//
//　ブラウザとOS別にスタイルシートを分ける
//
function setCSS(theURL)
{
	var os      = getOSType();
	var browser = getBrowserName();
	var version = getBrowserVersion();
	var dirName = theURL;
	if (os == "MacOS")   dirName += "style/mac/";
	if (os == "Windows") dirName += "style/win/";
	if (os == "UNIX")    dirName += "style/win/";
	if (browser == "Netscape") dirName += "nn";
	if (browser == "Explorer") dirName += "ie";
	if (browser == "Firefox") dirName += "ff";
	if ((version >= 3) && (version < 4))   dirName += "4.css";
	if ((version >= 5) && (version < 5.5))   dirName += "5.css";
	if ((version >= 5.5) && (version < 6)) dirName += "5.css";
	if ((version >= 6) && (version < 7))   dirName += "6.css";
	if ((version >= 7) && (version < 8))   dirName += "7.css";
	if ((version >= 8) && (version < 9))   dirName += "8.css";
	document.write("<LINK REL='stylesheet' type='text/css' HREF='"+dirName+"'>");
}