void msDelay(tInt msec) 
{ 
   tInt cntr_1, cntr_2; 
   for (cntr_1 = 0; cntr_1 <= msec; ++cntr_1 ) 
   { 
      for ( cntr_2 = 0; cntr_2 <= 5000; ++cntr_2); 
   } 
}