private function _setBool($key, $val) {
		if ($key && !$val) {
			$this->_result = preg_replace("/<if\." . $key . ">(.*?)<\/if\." . $key . ">/s", '', $this->_result);
		}
		$this->_result = str_replace("<if." . $key . ">", '', $this->_result);
		$this->_result = str_replace("</if." . $key . ">", '', $this->_result);
	}