Movie Clip Preloader

I am working on making a preloader that plays a movie clip as it loads. Its basically a movie of an old school elevator that has the pointer going down as the elevator goes down. I want to use that as my preloader, but I dont know how to control the video clip like that. So basically I want the movie clip to play as fast as the rest of the site loads. I’m not sure how to speed up/slow down the clip based on the speed the file is being loaded. I dont even know where to start. I’m not sure if I can start with a standard preloader and just edit that or if I need to create one from scratch. I am new to flash and dont know much about preloaders.

If anyone could give me some help or resources to look at that would be super awesome.