download problem in .swf file

[localhost1]

hi every body

i have a problem in downloading swf file. when i click on the icon to download the swf file then it downloads but the file is blank and not showing any flash aniimations. my code is as follows

 

$filepath="userdownloads/bulletin.swf";;
$filename="bulletin.swf";

downloadFile($filename,$filepath);


function downloadFile($filename,$filepath)
{

header("Content-type: application/x-swf-flash"); 
    header("Content-disposition: attachment; filename=".$filename); 
header("Content-Length: " . filesize($filepath));
   	header("Pragma: no-cache"); 
    header("Expires: 0"); 
    readfile($filepath); 

return;
}