public function checkTitle ($value, DataContainer $dc)
	{
		$db = Database::getInstance();

		$objTitle = $db->prepare("SELECT id FROM tl_elements WHERE NOT id=? AND pid=? AND title=?")
					   ->execute($dc->activeRecord->id, $dc->activeRecord->pid, $value);

		if ($objTitle->numRows > 0)
		{
			throw new Exception(sprintf($GLOBALS['TL_LANG']['ERR']['aliasExists'], $value));
		}
		
		return $value;
	}