Having a little trouble getting this code to redirect after send has been clicked.

Just goes to a 404 error page, yet the email still sends, I want the user to know the email has been sent. Any help would be appreciated.
thanks.

CODE:


<td colspan="2" bgcolor="#FFFFFF"> <form enctype="multipart/form-data" method="post" action="/cgi-bin/mailer">
<table border="0" align="center" bgcolor="6883b0">
<tr>
<td><b><font color="#FFFFFF" size="-1">Your name:</font></b></td>
<td><input type="text" name="NAME" maxlength="35" size="37" value=""></td>
</tr>
<tr>
<td><b><font color="#FFFFFF" size="-1">Your email:</font></b></td>
<td><input type="text" name="FROM" maxlength="35" size="37" value=""></td>
</tr>
<tr>
<td><b><font color="#FFFFFF" size="-1">Your comments:</font></b></td>
<td><textarea name="COMMENTS" cols="29" rows="4"></textarea></td>
</tr>
<tr>
<td colspan="2"><input type="submit" value="Send"> &nbsp; <input type="reset" value="Erase"></td>
</tr>
</table>
<input type="hidden" name="TO" value="stuartrhunter@hotmail.com">
<input type="hidden" name="SUBJECT" value="**HEYBYRNE.CO.UK - EMAIL**">
<input type="hidden" name="GOTOURL" value="http://www.heybyrne.co.uk/contact_confirm.htm">
</form></td>