var deviceBB = "blackberry";

//Initialize our user agent string to lower case.
var uagent = navigator.userAgent.toLowerCase();

//**************************
// Detects if the current browser is a BlackBerry of some sort.
function DetectBlackBerry()
{

   if (uagent.search(deviceBB) > -1)
      return true;
   else
      return false;
}