From the looks of it, you're using a pretty old version of UBB. I would suggest simply doing a complete upgrade to the latest version of UBB.
Another easy way is to upload a "clean" copy of UltBB.setup and Styles.file to your CGI directory. Just re-extract those files from your original .ZIP and upload them in ASCII.
An third method is to remove everything from the HEADER, FOOTER, and HEADER INSERT fields of your General Settings in the Control Panel. This will remove everything around the edges, but all your style (color) settings will remain.
After you've completed whichever method you choose, be sure to Update Threads from your control panel, so the threads all get the new (or is it old?) design.
---Skorpion
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This just in: the New York Police have just apprehended the person who let the dogs out.