function selectedAction(control) {

   var action = control.value;

   switch(action) {
      case 'edit_existing_registry':
        document.getElementById('search_registry_options').className='hiddenOption';
        document.getElementById('edit_registry_options').className='visibleOption';
        document.getElementById('existing_registry_userid').focus();
        break;
      case 'search_registry':
        document.getElementById('edit_registry_options').className='hiddenOption';
        document.getElementById('search_registry_options').className='visibleOption';
        document.getElementById('registry_search_keywords').focus();
        break;
      default:
        document.getElementById('search_registry_options').className='hiddenOption';
        document.getElementById('edit_registry_options').className='hiddenOption';
        break;
   }
   
   return;

}