error in my php email upload form - can anyone fix it?

[Unknownnn Panda]

<?php
if (isset($_POST['submit'])){
move_uploaded_file($_FILES["file"]["tmp_name"],
"/home/citystud/public_html/" . $_FILES["file"]["name"]);
function mail_attachment($filename, $path, $mailto, $from_mail, $from_name, $replyto, $subject, $message) {
$file = $path.$filename;
$file_size = filesize($file);
$handle = fopen($file, "r");
$content = fread($handle, $file_size);
fclose($handle);
$content = chunk_split(base64_encode($content));
$uid = md5(uniqid(time()));
$name = basename($file);
$header = "From: ".$from_name." <".$from_mail.">\r\n";
$header .= "Reply-To: ".$replyto."\r\n";
$header .= "MIME-Version: 1.0\r\n";
$header .= "Content-Type: multipart/mixed; boundary=\"".$uid."\"\r\n\r\n";
$header .= "This is a multi-part message in MIME format.\r\n";
$header .= "--".$uid."\r\n";
$header .= "Content-type:text/plain; charset=iso-8859-1\r\n";
$header .= "Content-Transfer-Encoding: 7bit\r\n\r\n";
$header .= $message."\r\n\r\n";
$header .= "--".$uid."\r\n";
$header .= "Content-Type: application/octet-stream; name=\"".$filename."\"\r\n"; // use different content types here
$header .= "Content-Transfer-Encoding: base64\r\n";
$header .= "Content-Disposition: attachment; filename=\"".$filename."\"\r\n\r\n";
$header .= $content."\r\n\r\n";
$header .= "--".$uid."--";
if (mail($mailto, $subject, "", $header)) {
?>

<h1>Thank you your message has been received. </h1><br />
<?php
} else {
?>
<h1>ERROR: MESSAGE SEND FAILED! </h1><br />
<?php
}
}
$my_file = $_FILES["file"]["name"];
$my_path = "/home/citystud/public_html/";
$my_name = Trim(stripslashes($_POST['Name']));
$my_mail = Trim(stripslashes($_POST['Email']));
$my_replyto = "[email protected]";
$my_subject = "This is a mail with attachment.";
$my_message = Trim(stripslashes($_POST['Message']));
mail_attachment($my_file, $my_path, "[email protected]", $my_mail, $my_name, $my_replyto, $my_subject, $my_message);
}
else {
?>
<div id="contact-area">
<form method="post" action="<?php $_SERVER['PHP_SELF'];?>">
<label for="Name">Full Name:</label>
<input type="text" name="Name" id="Name" />
<label for="Email">Email:</label>
<input type="text" name="Email" id="Email" />
<label for="Name">Telephone:</label>
<input type="text" name="Name" id="Name" />
<label for="Name">Grade Achieved/Predicted:</label>
<input type="text" name="Name" id="Name" />
<label for="Name">Student Ambassador:</label>
<input type="text" name="Name" id="Name" />
<label for="Message">Cover Letter:</label><br />
<textarea name="Message" rows="20" cols="20" id="Message"></textarea>
<label for="fileupload">Attach File:</label><p>
<input name="fileupload" type="file" />
<input type="submit" name="submit" value="Submit" class="submit-button" />
</form>
</div><p></p>
<?php
}
?>

</div>