header problem for mobile browser

Hi, I want to make a php file for download a jad file. I am using following script to let browser understand that jad file is coming and download it. But I have very interesting problem. If user open browser and write correct addres following script let the download file. But if the user open browser and write wrong addres and get some error. After write correct address, still getting same error. I think following script can not reset the previos header and browser still using previous header and bring back an error. What should I do, for this problem, any idea $SRC_FILE = $file; $download_size = filesize($SRC_FILE); $filename = basename($SRC_FILE); header("Content-Type: text/vnd.sun.j2me.app-descriptor"); header("Content-Disposition: attachment; filename=$filename"); header("Accept-Ranges: bytes"); header("Content-Length: $download_size"); @readfile($SRC_FILE);