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You can do a couple of things:
1. Wait until Fast indexes your site again (about a month is my guess before all pages should have be crawled.)
2. Do a 302 permanent redirect to the new url's. Eg. point domain.com/old_page.html to domain.com/new_page.html and then wait for Fast to reindex.
3. Flip out your flexible friend and pay for indexing at Lycos, PositionTech or some other vendor. This can be a costly venture if you have many pages (181 will cost quite a bit - maybe just pay for the really important ones?), but will get your listings updated in about 48 hours.
I'd probably look into the 302 redirect [searchengineworld.com] which will solve the problem with all the 404 not found errors you probably have.