any idea how? i click on the drop down box when im saving as, but then the only options are cs3 and cs4. halp guys
After a quick Google search, it would seem it isn't possible. The best thing you can do is save into CS3 format, and get someone with CS3 to save into Flash 8.
This is normal procedure; most companies only support the previous generation of their products in their newest line, to ease the transition (Like Nintendo, for example)
Why do you want to save into Flash 8, anyways?