Browser test and "noflashplugin" page for flash 6?

Hey all, is there a tutorial for how to force a browser to check for flash 6 plugin and then redirect to a “noflash” html page if it’s not found? I was under the impression that a flash 6 site wouldn’t load under a flash 5 plugin but after checking my site on a friend’s computer without flash 6 (flash 5), my site looked screwy and just plain awful.

Thanks in advance (if there isn;t a tutorial, does anyone know how to achieve this?)