last = new Date();
   msec = 0;

   function mb() {
        present = new Date();
        d_t = parseInt( present.getTime() - last.getTime() );

        last = present;
        if (d_t < msec ) {
           msec = 1000;
           return false;
        } else {
           msec  = 1000;
           return true;
        }
   }