//
//　OS (Operating System)チェック
//　　　　種　　　類　　　：　　戻　り　値
//　Macintosh 　-> MacOS
//　Windows95/98/NT/2000 ->　Windows
//　上記以外の場合はWindows
//
function getOSType()
{
var RetCode = "";
var uAgent = navigator.userAgent.toUpperCase();
RetCode = "Windows";
if (uAgent.indexOf("MAC") >= 0) RetCode = "MacOS";
if (uAgent.indexOf("WIN") >= 0) RetCode = "Windows";
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";
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 == "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;
}

//
//　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 += "macstyle";
if (os == "Windows") dirName += "winstyle";
//if ((version >= 3) && (version < 4)) dirName += "3";
//if ((version >= 4) && (version < 5)) dirName += "4";
//if ((version >= 5) && (version < 5.5)) dirName += "5";
//if ((version >= 5.5) && (version < 6)) dirName += "5.5";
//if ((version >= 6) && (version < 7)) dirName += "6";
document.writeln("<LINK REL=\"stylesheet\" type=\"text/css\" HREF=\""+dirName+".css\">");
}