CS3 AS2 alpha values > 100

When assigning alpha values to a movieclip I noticed that there is no roof, I assumed it would stop accumulating value when 100 was reached. The result is that movieclips inside my movieclip appear to be accumulating alpha values after the parent has reached 100. but when traced, the parent is f.e. 249 and the child still 50, though both look like they’re at 100. this is bugging up a loop of mine, will have another go at it, but thought to check if anyone’s had any thoughts on it.

-thomas-