function elementSwapDisabled(eEnabledId, eDisabledId) {
// alert(eEnabledId+' : '+eDisabledId);
 elemEnabled = document.getElementById(eEnabledId);
 elemDisabled = document.getElementById(eDisabledId);
 if ( elemEnabled != null && elemDisabled != null) {
   elemEnabled.disabled = false;
   elemDisabled.disabled = true;
 }
  
}