the file posted on 14 march didn't work for me - the e-mails were not sent.

i fixed it by replacing this code in contact_us.php:

if (isset($HTTP_GET_VARS['action']) && ($HTTP_GET_VARS['action'] == 'success')) {

with this one:

if (isset($HTTP_GET_VARS['action']) && ($HTTP_GET_VARS['action'] == 'send')) {


the enclosed zip is the same as the original, you'll need to manually edit the above change

More...