Search engines are still in their infancy to read and understand flash.
Spiders can crawl textual content in SWF files of all kinds. This includes Flash "gadgets" such as buttons or menus, self-contained Flash websites, and everything in between. But a website completely made in Flash is quite difficult for spiders to crawl. Also, it increases your page loading speed which results in a bad user experience.
Its better that you make a text based website... than Flash based