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If the answer is no or "well . . sorta . . ." rethink how you're working the page.
In this case you can use a Flash navigation **IF** you provide other obvious means to get around the site. Bottom-page text links are one choice.
One possible solution is to use Flash's "Detect Plugin" publishing settings. This is intended to create a page that has the Flash if the plugin is detected, or a sitemap with a graphic and clickable imagemap if it's not. This adds quite a bit of Javascript to your page and now in addition to being Flash-dependent, it's Javascript-dependent. Even worse, the methods they use do NOT work on all browsers and all situations. It's a mess (IMO.)
Same philosophy, don't depend on anything that "may or may not work." If I'm forced into creating Flash nav elements, I hard-code the object in and provide plain-text links. At least that way, there will ALWAYS be something working.