Adding custom artifacts to footer

Hi,
I’d like to add my Sitelock image to my sites footer and center it under the footer text. Please see http://insightangle.biz for an example.
Temporarily, I’ve added the Href and image needed to the footer.php section directly here:

</footer><!-- #colophon -->HERE
</div><!-- #page -->
<?php wp_footer(); ?>
</body>
</html>

As you can see its in the right place, but I’d like it to be centered under the footer banner.

I’ll add the code you provide as a custom css update (and remove the placeholder code in Footer.php
Thanks a bunch!
Mark

PS… upgraded to premium 🙂