//　Macintosh 　-> MacOS
//　Windows95/98/NT/2000/XP ->　Windows
//　UNIX ->　UNIX
function getOSType() {
  var uAgent = navigator.userAgent.toUpperCase();
  if (uAgent.indexOf("MAC") >= 0) return "mac";
  if (uAgent.indexOf("WIN") >= 0) return "win";
  if (uAgent.indexOf("X11") >= 0) return "unix";
  return "";
}
//　Netscape Navigator -> Netscape
//　Internet Explorer ->　Explorer
//　Safari ->　Safari
//　Opera ->　Opera
function getBrowserName() {
  var aName = navigator.appName.toUpperCase();
  var uName = navigator.userAgent.toUpperCase();
  if (uName.indexOf("SAFARI") >= 0) return "saf";
  if (uName.indexOf("OPERA") >= 0) return "ope";
  if (aName.indexOf("NETSCAPE") >= 0) return "nn";
  if (aName.indexOf("MICROSOFT") >= 0) return "ie";
  return "";
}
function getBrowserVersion() {
  var browser = getBrowserName();
  var version = 0;
  var s = 0;
  var e = 0;
  var appVer = navigator.appVersion;
  var uName = navigator.userAgent.toUpperCase();
  if (browser == "saf") {
    version = eval(appVer.substring(0,3)) - 4;
  }
  if (browser == "ope") {
    s = uName.indexOf("OPERA ",0) + 6;
    e = uName.indexOf(" ",s);
    version = eval(uName.substring(s,e));
  }
  if (browser == "nn") {
    s = appVer.indexOf(" ",0);
    version = eval(appVer.substring(0,s));
    if (version >= 5) version++;
  }
  if (browser == "ie") {
    appVer = navigator.userAgent;
    s = appVer.indexOf("MSIE ",0) + 5;
    e = appVer.indexOf(";",s);
    version = eval(appVer.substring(s,e));
  }
  return version;
}