Power Gallery Comments Out in Power CMS?

Hello, this is the first problem I have had with Power Gallery as I have used it with a few sites so far and have been pleased. It seems that once I paste it into the source code in a Power CMS page that it gets "commented out" and therefore does not display.

I paste this:

<?php
$pg_id = '1';
$pg_theme = 'DLM';
include('/homepages/40/d369590415/htdocs/divineloveministries/gallery/galleries/flow/index.php');
?>

after updating the page, and going back to the code, I get this:

<!--?php
$pg_id = '1';
$pg_theme = 'DLM';
include('/homepages/40/d369590415/htdocs/divineloveministries/gallery/galleries/flow/index.php');
?-->


even if I delete the !-- and -- when I hit update it automatically goes back in. Can you tell me what I might be doing wrong?

Thanks so much!
~Chris