I have changed arbitroweb.php to be able to click and download a pdf file link. May be extended to any kind. Original snippet was
$fp = fopen($realURL, "r");
        if($fp)
        {
                util_writelog("arbitroweb", $realURL, "200");
                while($line=fgets($fp, 4096))
                {
                        $line = StripSlashes($line);

                        echo adjust_all($line);
                }
                fclose($fp);
        }

And I have changed to

if($fp)
        {
                util_writelog("arbitroweb", $realURL, "200");
                while($line=fgets($fp, 4096))
                {
                        if (!isset($birkerecik)) $pdfstatus= strncasecmp ($line, "%PDF", 4);
                        if ($pdfstatus!=0){
                                $line = StripSlashes($line);
                                echo adjust_all($line);
                                $birkerecik=1;
                        }
                        else
                        {
                                header("Content-type: application/pdf");
                                readfile($realURL);
                                break;
                        }
                }
                fclose($fp);
                unset($birkerecik);
         }

Nice work by the way.

Mesut Ali Ergin
ergin@ics.yeditepe.edu.tr