Определение версий браузера в JavaScript

<p>Браузер</p>
  <div id='name'></div>
   
  <p>Версия браузера</p>
  <div id='version'></div>

  <p>Операционная система</p>
  <div id='os'></div>

<script type="text/javascript">
var BrowserDetect = {
  init: function () {
  this.browser = this.searchString(this.dataBrowser) || "An unknown browser";
  this.version = this.searchVersion(navigator.userAgent) || this.searchVersion(navigator.appVersion) || "an unknown version";
  this.OS = this.searchString(this.dataOS) || "an unknown OS";
  },
  searchString: function (data) {
  for (var i=0;i<data.length;i++) {
  var dataString = data[i].string;
  var dataProp = data[i].prop;
  this.versionSearchString = data[i].versionSearch || data[i].identity;
  if (dataString) {
  if (dataString.indexOf(data[i].subString) != -1)
  return data[i].identity;
  }
  else if (dataProp)
  return data[i].identity;
  }
  },
  searchVersion: function (dataString) {
  var index = dataString.indexOf(this.versionSearchString);
  if (index == -1) return;
  return parseFloat(dataString.substring(index+this.versionSearchString.length+1));
  },
  dataBrowser: [
  {
  string: navigator.userAgent,
  subString: "Chrome",
  identity: "Chrome"
  },
  { string: navigator.userAgent,
  subString: "OmniWeb",
  versionSearch: "OmniWeb/",
  identity: "OmniWeb"
  },
  {
  string: navigator.vendor,
  subString: "Apple",
  identity: "Safari",
  versionSearch: "Version"
  },
  {
  prop: window.opera,
  identity: "Opera",
  versionSearch: "Version"
  },
  {
  string: navigator.vendor,
  subString: "iCab",
  identity: "iCab"
  },
  {
  string: navigator.vendor,
  subString: "KDE",
  identity: "Konqueror"
  },
  {
  string: navigator.userAgent,
  subString: "Firefox",
  identity: "Firefox"
  },
  {
  string: navigator.vendor,
  subString: "Camino",
  identity: "Camino"
  },
  {  
  /* For Newer Netscapes (6+) */
  string: navigator.userAgent,
  subString: "Netscape",
  identity: "Netscape"
  },
  {
  string: navigator.userAgent,
  subString: "MSIE",
  identity: "Internet Explorer",
  versionSearch: "MSIE"
  },
  {
  string: navigator.userAgent,
  subString: "Gecko",
  identity: "Mozilla",
  versionSearch: "rv"
  },
  {  
  /* For Older Netscapes (4-) */
  string: navigator.userAgent,
  subString: "Mozilla",
  identity: "Netscape",
  versionSearch: "Mozilla"
  }
  ],
  dataOS : [
  {
  string: navigator.platform,
  subString: "Win",
  identity: "Windows"
  },
  {
  string: navigator.platform,
  subString: "Mac",
  identity: "Mac"
  },
  {
  string: navigator.userAgent,
  subString: "iPhone",
  identity: "iPhone/iPod"
  },
  {
  string: navigator.platform,
  subString: "Linux",
  identity: "Linux"
  }
  ]

};
BrowserDetect.init();

document.getElementById("name").innerHTML=BrowserDetect.browser;
document.getElementById("version").innerHTML=BrowserDetect.version;
document.getElementById("os").innerHTML=BrowserDetect.OS
</script>