function checkmp(f) {
   if (f.username.value == "") {
      document.getElementById('user').style.fontWeight = 'bold';
      f.username.focus();
      return (false);
   }
   if (f.username.value.length < 1) {
      document.getElementById('user').style.fontWeight = 'bold';
      f.username.focus();
      return (false);
   }
   if (f.password.value == "") {
      document.getElementById('pass').style.fontWeight = 'bold';
      f.password.focus();
      return (false);
   }
   if (f.password.value.length < 1) {
      document.getElementById('pass').style.fontWeight = 'bold';
      f.password.focus();
      return (false);
   }
   return (true);
}