Get Browser's name and it's version number ...

getBrowser.js

function getBrowser() {
  var nVer = navigator.appVersion;
  var nAgt = navigator.userAgent;
  var browserName = navigator.appName;
  var fullVersion = '' + parseFloat(navigator.appVersion);
  var majorVersion = parseInt(navigator.appVersion, 10);
  var nameOffset, verOffset, ix;

  // In Opera, the true version is after "Opera" or after "Version"
  if ((verOffset = nAgt.indexOf("Opera")) != -1) {
    browserName = "Opera";
    fullVersion = nAgt.substring(verOffset + 6);
    if ((verOffset = nAgt.indexOf("Version")) != -1)
      fullVersion = nAgt.substring(verOffset + 8);
  }
  // In MSIE, the true version is after "MSIE" in userAgent
  else if ((verOffset = nAgt.indexOf("MSIE")) != -1) {
    browserName = "Microsoft Internet Explorer";
    fullVersion = nAgt.substring(verOffset + 5);
  }
  // In Chrome, the true version is after "Chrome"
  else if ((verOffset = nAgt.indexOf("Chrome")) != -1) {
    browserName = "Chrome";
    fullVersion = nAgt.substring(verOffset + 7);
  }
  // In Safari, the true version is after "Safari" or after "Version"
  else if ((verOffset = nAgt.indexOf("Safari")) != -1) {
    browserName = "Safari";
    fullVersion = nAgt.substring(verOffset + 7);
    if ((verOffset = nAgt.indexOf("Version")) != -1)
      fullVersion = nAgt.substring(verOffset + 8);
  }
  // In Firefox, the true version is after "Firefox"
  else if ((verOffset = nAgt.indexOf("Firefox")) != -1) {
    browserName = "Firefox";
    fullVersion = nAgt.substring(verOffset + 8);
  }
  // In most other browsers, "name/version" is at the end of userAgent
  else if ((nameOffset = nAgt.lastIndexOf(' ') + 1) <
    (verOffset = nAgt.lastIndexOf('/'))) {
    browserName = nAgt.substring(nameOffset, verOffset);
    fullVersion = nAgt.substring(verOffset + 1);
    if (browserName.toLowerCase() == browserName.toUpperCase()) {
      browserName = navigator.appName;
    }
  }
  // trim the fullVersion string at semicolon/space if present
  if ((ix = fullVersion.indexOf(";")) != -1)
    fullVersion = fullVersion.substring(0, ix);
  if ((ix = fullVersion.indexOf(" ")) != -1)
    fullVersion = fullVersion.substring(0, ix);

  majorVersion = parseInt('' + fullVersion, 10);
  if (isNaN(majorVersion)) {
    fullVersion = '' + parseFloat(navigator.appVersion);
    majorVersion = parseInt(navigator.appVersion, 10);
  }


  return [browserName, fullVersion];
}