function markbook_menu($may_cache) {
  $items = array();
  if($may_cache) {
    $items[]=array(	'path'		=>	'markbook',
			'title'		=>	t('Markbook'),
			'callback'	=>	'markbook_page',
			'access'	=>	user_access('access markbook'),
			'type'		=>	MENU_CALLBACK);		//Take command of all /markbook URLs
  } else {
    $items[]=array(	'path'		=>	'markbook',
			'title'		=>	t('my markbook'),
			'access'	=>	user_access('edit own markbook'));		//display "my markbook" item
'type' => MENU_DYNAMIC_ITEM,
);
  }

	return $items;
}