///////////////////////////////////
// ブラウザの違いを細かく判別
///////////////////////////////////
<!--
//　Netscape Navigator ->  Netscape
//　Internet Explorer  ->　Explorer
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;
}
//　Macintosh           　->  MacOS
//　Windows95/98/NT/2000  ->　Windows
//　UNIX                  ->　UNIX
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;
}
// -->