Mail with Attachment

[Anon]

i m using this code in php

<?
include "mime_mail.inc";
print "Sending files to $recipient.";

set up $mail object

$mail = new mime_mail;
$mail->from = "[e-mail]";
$mail->to = $recipient;
$mail->subject = "Your files";
$mail->body = "Hello, here are your files.";

copy file to server

exec("cp $send_file1 /tmp/$send_file1_name");

file read

$content_type1 = "$send_file1_type";
$fp1=fopen("/tmp/$send_file1_name","r");
$data1=fread($fp1,filesize($send_file1));
fclose($fp1);

remove tmp file

exec("rm -rf /tmp/$send_file1_name");

attach

$mail->add_attachment($data1,$send_file1_name, $content_type1);

send e-mail

$mail->send();
print "file1:$send_file1_name ";
print "I've sent off the e-mail.";
?>

i can recieve the mail but with no attachment plz find what the error is y i m not getting attached file. as i had uploaded the file "mime_mail.inc"