Can I use Flash?

Flash and Shockwave

Search engines do not read Flash and Shockwave files. Content and links in any of these formats will not be accessible by search engines, although Google can now follow links in Flash. Search engines basically only read regular text on a web page. They don't read text and follow links within special formats such as Java Applets or any other formats that require the user to have a certain program installed.

Read more about Flash, Macromedia and Java Applets in Links and Navigation.

Image maps or navigation buttons

Not all search engines read image maps. Most search engines read navigation buttons. If you use image maps, you should add the same links as you have in the image maps as regular text-based links.

Read more about image maps and navigation buttons in Links and Navigation.

Search engines cannot read text inside “flash”. Some Engines, but not all, follow links inside Flash files.  

Solution

Make an Entrance Page or 'Splash Page' with a Flash and a HTML version of the site or "breadcrumb" text links with some html text under the fold of the page.