download function

Hello, I have the following problem: I want users to download content that is stored in a private directory, as a downloadable file. So I do: <code> header( "Content-type: octet/stream" ) ; header( "Content-Length: ".filesize( $file_path ) ) ; header( "Content-Disposition: attachment; filename={$filename}" ) ; header( "Content-transfer-encoding: binary" ) ; echo "\n" ; readfile( $file_path ) ; </code> Everything works just fine, except that the main IE (5.5) windows underneath the download box shows a "The page cannot be displayed" error, which I would just as well replace by my own content. How can I do? Thanks Ignatius