Referencing a different levels timeline?

i just wanted to know if its possible to reference a different levels timeline. I want to create transitions in my site when loading dynamic content. I looked at the tutorial but it specifiacally relates to loading movies into movie clips.
In my site i am already loading movies into levels.

I have my navigation on the main timeline (level 0) and im loading and unloading each sections content into level 1. Is it possible to load a movie on level 2 with a mask and preloader that will cover the content being loaded into level 1?