CS3 won't let me test my ActionScript

Hi. Sorry for the horribly n00bish question, but I’ve tried everything (searched everywhere) but I can’t figure out why Flash CS3 won’t let me test my frickin’ movie! I’m following this simple example, but for some reason “Test Movie” is grayed out.

So I have two .as files, one for each code chunk on that page I linked, paths/folders set up fine, but still I can’t run testing.as. And this isn’t just a problem with these files–I can’t test any code at all, but it works as long as the .as is linked to an .fla. Any idea why?