How do I start movieclip playing when not fully downloaded

Hi.
I need some help with a small animation. I have a drawing effect animation (around 200 frames) which is in a movieclip within a movieclip (_level2?).
When I run this swf I want the movieclip to start playing even if it is not fully downloaded, like it would if the animation frames were in the main timeline. How can I do this?
At the moment it waits for the whole movieclip to download before it plays. I want it to start and play as it downloads.
Can soemone please tell me how to achieve this?
Thanks.=)