Put Advanced Guestbook in a page

Hello all.
I'm used this <?php include "guestbook/index.php"; ?> for include AG in an existing page.
Seems that work but the images don't show.
I have to include another command maybe the <?php include path "guestbook/index.php"; ?>
Or I have to put the path into other files?
Deep help needed please!

I putted this
<?php
require ("$DOCUMENT_ROOT/relativepath/guestbook/index.php") ;
?>
but the img still don't appears and addentry.php won't work because it search for
/relativepath/addentry.php
instead of
/relativepath/guestbook/addentry.php.

Seems that the template doesn't inclosed in the path.

How to put the path in order to work???

Thanks