CIBlockResult::SetIBlockTag

function SetIBlockTag($iblock_id)
{
	if(is_array($iblock_id))
	{
		foreach($iblock_id as $id)
			$this->SetIBlockTag($id);
	}
	else
	{
		$id = intval($iblock_id);
		if ($id > 0)
			$this->_FILTER_IBLOCK_ID[$id] = true;
	}
}