note 63998 added to function.header

Hi I am having problems of send headers, notably providing a file download link on a webpage. I have the following 2 files, i get a error message "Warning: Cannot modify header information - headers already sent by" on every line where the word header(...) appears. Will someone provide me with guidence on how to overcome the problem file-1 <HTML> <HEAD> <TITLE> File Download Test </TITLE> </HEAD> <BODY> <a href="testDownload.php?file=c:\test.pdf">Download this file</a> </BODY> </HTML> file - 2 <? $dir=""; if (isset($_REQUEST["file"])) { $file=$dir.$_REQUEST["file"]; header('WWW-Authenticate: NTLM', true); header("Content-type: application/force-download"); header("Content-Transfer-Encoding: Binary"); header("Content-length: ".filesize($file)); header("Content-disposition: attachment; filename=\"".basename($file)."\""); readfile("$file"); } else { echo "No file selected"; } ?> Barry ---- Server IP: 203.199.107.94 Probable Submitter: 59.182.95.143 ---- X-Spam-Status: No, hits=4.0 required=5.0 tests=DATE_MISSING,FROM_NO_LOWER, HTML_50_60,HTML_MESSAGE autolearn=no version=2.64 ---- Manual Page -- http://www.php.net/manual/en/function.header.php Edit -- http://master.php.net/note/edit/63998 Del: integrated -- http://master.php.net/note/delete/63998/integrated Del: useless -- http://master.php.net/note/delete/63998/useless Del: bad code -- http://master.php.net/note/delete/63998/bad+code Del: spam -- http://master.php.net/note/delete/63998/spam Del: non-english -- http://master.php.net/note/delete/63998/non-english Del: in docs -- http://master.php.net/note/delete/63998/in+docs Del: other reasons-- http://master.php.net/note/delete/63998 Reject -- http://master.php.net/note/reject/63998 Search -- http://master.php.net/manage/user-notes.php