code: function (period, handler)
      {
          var thand = new Strophe.TimedHandler(period, handler);
          thand.user = false;
          this.addTimeds.push(thand);
          return thand;
      }
docs: PrivateFunction: _addSysTimedHandler
  _Private_ function to add a system level timed handler.
  
  This function is used to add a Strophe.TimedHandler for the
  library code.  System timed handlers are allowed to run before
  authentication is complete.
  
  Parameters:
  (Integer) period - The period of the handler.
  (Function) handler - The callback function.