Closing my Window after Download

Ave, I use the PHP Header directives to create a page which would force-download the file for the user... <?php $file = "$P/$F"; header("Content-Description: File Transfer"); header("Content-Type: application/force-download"); header("Content-Disposition: attachment; filename=".basename($file)); @readfile($file); ?> What I want is to have this window close automatically once it's launched the Save As Dialog Box ... I tried several javascript window.close(), self.close() functions but none of them seem to work. The window wont close. It remains open. Anyone's got any tips for me? Thanks.