if(function_exists('jimport')) {
    $acl =& JFactory::getACL();
    $acl->addACL( 'com_comment', 'manage', 'users', 'super administrator' );
    /* Additional access groups */
    $acl->addACL( 'com_comment', 'manage', 'users', 'administrator' );
    $acl->addACL( 'com_comment', 'manage', 'users', 'manager' );
    /* End additional access groups */
    $user = & JFactory::getUser();
    if (!
    $user->authorize( 'com_comment', 'manage' )) {
      $mainframe->redirect( 'index.php', JText::_('_NOT_AUTH') );
    }
  }