dmbox on "Backstretch JS Question"

I inherited this website project, and cannot determine how they have the backstretch JavaScript running on the Word Press pages.

http://digitalmediabox.net/

This is found in the index.html code:

<script src="/lib/jquery-1.6.4.min.js"></script>
<script src="/jquery.backstretch.min.js"></script>
<script>$.backstretch("images/deer_lakes_clouds.gif");</script>

Any ideas how they got it in to Word Press?

Thanks in advance,
Doug