function hide_control()
{
  
  var sl = document.getElementById('cID');
  var el = document.getElementById('el');
  var e1 = document.getElementById('e1');
  
  if (sl.value == '602' || sl.value == ""){
 
    el.style.display = '';
    e1.style.display = '';
  }
  else {
    el.style.display='none';
    e1.style.display='none';
  }
}