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yeah that's a simple one, you could put the XOOPS install in a sub-directory of your domain, and then have the flash as the main drop page for your site.
Not sure how this would affect your search engine listings, perhaps not at all, if you add non-flash links to the page then it should allow the search engines to follow.
Kind Regards.
Tom
http://bassmanthemes.com
http://www.xoopslance.com