I just tested it and it is compatible with the guestbook plugin. You might simply have to use the manual insert method, which would involve inserting the following code in guestcomments.php, just above the comment field:


< ?php do_action('secure_image', $post->ID); ?>


You should also set this setting to "false" in the anti-spam plugin file:


// Set this to TRUE if you will be editing your comments file (add this php line wherever you want the anti-spam image inserted in the comments.php file: do_action('secure_image', $post->ID); )
// Set this to FALSE if you want to use the default JavaScript positioning
$cas_manualinsert = false;