else if($dopost=='thumbalt'){    if( empty($id) )    {        header('HTTP/1.1 500 Internal Server Error');        echo 'No ID';        exit(0);    }    if (!is_array($_SESSION['file_filename']) || !isset($_SESSION['file_filename'][$id]))    {        header('HTTP/1.1 404 Not found');        exit(0);    }    if($cfg_soft_lang=='utf-8') $file_filename = $_SESSION['file_filename'][$id];    else $file_filename = iconv( 'UTF-8', 'gb2312//IGNORE' , $_SESSION['file_filename'][$id]);    echo $file_filename;    exit(0);}