Playing a movieclip while preloading

I am trying to figure out how to connect a preloader with a movieclip I made. Essentialy what I want to happen is for the heart graphic to start out black and white and as the percentage preloaded increase, the color version of the heart I masked will appear. Here is the link to the .FLA file. I have a basic mask over the colored version of the heart that I motion tweened to move. Now that I have this setup, how do I plug it into a preloader to enable it to sub as a load bar. Partially coloring the image as more of the document is loaded.

Thanks for your help on this.

Greg

Link:

www.gregwrightdesigns.com/heart_loader.fla