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I can suggest the XoOgle module. I downloaded it and installed it on my site (
http://www.lost-doggies.com) and once you register to use it (free, with Google itself) you can set it to search your site using either the XOOPS search facility or Googles own technology. It can also be used to search the web using Googles own technology, but the results are shown in your own site and using your own theme. Its great. Give it a try. It should work in the context that you suggest.
Cheers
Ted