Preloader with no timeline

Hi there,

My flash application is completely run by classes, each screen being a different class and that class controlling everything on the given screen, with the Main class controlling which screen is on and when.

I need a preloader, as my application uses lots of images, sound and video. But I can only find tutorials which focus on loading content in the timeline, and moving onto a frame instead of executing a class.

Could anyone point me to a tutorial on this?