Flash size

hy!

I guess it’s a noob question, but I would like to know how I could lower my flash movie without changing quality. I use mostly imported images from Fireworks. I’m asking because my flash is not ready at all and it’s already over 1Mb (it’s dimensions are 960px * 530px - 30fps). It would be great if you could give me some techniques which can lower my size. I read somewhere that you don’t have to create frames if u want something to be longer (tween, etc), there is an actionscript for that, could you share that with me? If my size can’t be lowered, could u help me by telling some basics how to set up a “loading screen”?

Thanks,
Shadyz