checkBrowserVersion.js

function checkBrowserVersion() {
    var objappVersion = navigator.appVersion;
    var objAgent = navigator.userAgent;
    var objbrowserName = navigator.appName;
    var objfullVersion = ''+parseFloat(navigator.appVersion);
    var objBrMajorVersion = parseInt(navigator.appVersion,10);
    var objOffsetName,objOffsetVersion,ix;

    // In Chrome
    if ((objOffsetVersion=objAgent.indexOf("Chrome"))!=-1) {
      objbrowserName = "Chrome";
      objfullVersion = objAgent.substring(objOffsetVersion+7);
    }

    // In Microsoft internet explorer
    else if ((objOffsetVersion=objAgent.indexOf("MSIE"))!=-1) {
     objbrowserName = "Microsoft Internet Explorer";
     objfullVersion = objAgent.substring(objOffsetVersion+5);
    }

    // In Firefox
    else if ((objOffsetVersion=objAgent.indexOf("Firefox"))!=-1) {
      objbrowserName = "Firefox";
    }

    // In Safari
    else if ((objOffsetVersion=objAgent.indexOf("Safari"))!=-1) {
      objbrowserName = "Safari";
      objfullVersion = objAgent.substring(objOffsetVersion+7);
      if ((objOffsetVersion=objAgent.indexOf("Version"))!=-1)
        objfullVersion = objAgent.substring(objOffsetVersion+8);
    }

    // For other browser "name/version" is at the end of userAgent
    else if ( (objOffsetName=objAgent.lastIndexOf(' ')+1) < (objOffsetVersion=objAgent.lastIndexOf('/')) ) {
      objbrowserName = objAgent.substring(objOffsetName,objOffsetVersion); objfullVersion = objAgent.substring(objOffsetVersion+1);
      if (objbrowserName.toLowerCase()==objbrowserName.toUpperCase()) { objbrowserName = navigator.appName;
      }
    }

    // trimming the fullVersion string at semicolon/space if present
    if ((ix=objfullVersion.indexOf(";"))!=-1) objfullVersion=objfullVersion.substring(0,ix);
      if ((ix=objfullVersion.indexOf(" "))!=-1)
        objfullVersion=objfullVersion.substring(0,ix);
      objBrMajorVersion = parseInt(''+objfullVersion,10);
      if (isNaN(objBrMajorVersion)) {
        objfullVersion = ''+parseFloat(navigator.appVersion);
        objBrMajorVersion = parseInt(navigator.appVersion,10);
    }
    $('body').addClass(objbrowserName + objBrMajorVersion);
  }