private function digToc($id, array $header, array &$headers){
		$keys = array_keys($headers);
		krsort($keys);
		$done = false;
		foreach( $keys as $key ){
			if( $headers[$key]['level'] < $header['level'] ){
				if( !$this->digToc($id, $header, $headers[$key]['children']) ){
					$headers[$key]['children'][$id] = $header;
				}
				return true;
			}
		}
		return false;
	}