Shtml Server Side Include problem on website

We are having a problem with some web pages that are not working from our Domino 7.0.2 web server. Part of the page displays ok, but the bottom 2/3 doesn’t. The error shows up when it tries to do the following request: “GET /ucomm/templatedependents/images/external_link.gif HTTP/1.1” It gives a status error of “200 ??? Unknown Status Code”. The website works both on my office pc by setting up IIS and on an apache server, but not when we copy the site over to Domino. Does anyone know of any settings on the server config page that could be causing this, that might need changed? Thanks!