<?
$files = Array("01" => "Allgemeine_Geschaeftsbedingungen.pdf",
               "02" => "Lastschriftvordruck.pdf",
               "03" => "Anfahrtsbeschreibung.pdf",
               "04" => "How_to_find_us.pdf",
               "05" => "Plan_d'accès.pdf",);

$filename = "../dl_files/".$files[$_GET[what]];

header("Content-Type: x-type/subtype");
header("Content-Length: ".filesize($filename));
header("Content-Disposition: attachment; filename=".$files[$_GET[what]]);
readfile($filename);
?>