>>Already done. http://www.utmag.com/MainPage.jpg gives me a 404 error. Hence no background image. I've looked at the firewall logs, and see the request and response - File Not Found. Maybe an external network problem...
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>Do you have anything in place as far as security goes that would intercept the base href?

No. Have you tried removing it? After Tidy 'Cleans' the page, the image shows fine without it.