function BrowserInfo() 
{
  var agt = navigator.userAgent.toLowerCase();
  this.version = parseFloat(navigator.appVersion);
 
  if (agt.indexOf("opera") != -1) 
    {
      this.name = "Opera";
      this.version = parseFloat(agt.substr(agt.indexOf("opera") + 6));
    }
  else this.name = "Unknown";  
}

// this object contains info about this browser
var currentBrowser = new BrowserInfo();