Help needed PLEASE!

hello,

I was wondering if you can help me! Basically I am working with video in flash for an installation. What I am trying to do is have one long continuous film that plays, but if the microphone picks up a sound over a certain level, then it triggers a new piece of film.

so for example, the film is on my standing on the street, when a viewer shouts into the mic i was for it to activate a new piece of film showing me running away.

Do you know if this is possible? If so could you possibly point me into the right direction. I will me REALLY grateful!

Many thanks,

Ellie