var browserName;
var browserVersion;
var browserVersionDecimal = 0;
var browserPlatform;
var tempVersion;

if (navigator.appName.toLowerCase().indexOf("netscape") != -1)
{
    browserName = "NS";
    browserVersion = parseInt(navigator.appVersion.charAt(0));
}
else if (navigator.appName.toLowerCase().indexOf("microsoft") != -1)
{
    browserName = "MSIE";
    tempVersion = parseInt(navigator.appVersion.charAt(0));
    if (tempVersion < 4)
      browserVersion = tempVersion;
    else {
      browserVersion = parseInt(navigator.appVersion.substr((navigator.appVersion.indexOf("MSIE ") + 5),1));
      browserVersionDecimal = parseInt(navigator.appVersion.substr((navigator.appVersion.indexOf("MSIE ") + 7),1));
    }

}
else
{
    browserName = "?";
    browserVersion = parseInt(navigator.appVersion.charAt(0));
}

if ((browserName == "NS") && (browserVersion < 4))
  browserPlatform = "WINDOWS"
else
{
  if (navigator.platform.toLowerCase().indexOf("win") != -1)
      browserPlatform = "WINDOWS";
  else if (navigator.platform.toLowerCase().indexOf("mac") != -1)
      browserPlatform = "MAC";
  else
      browserPlatform = "?";
}