Loading movie clips one after another, then looping

I created 3 movie clips inside my flash movie. It starts off with a white background. I need the 1st clip to play, then the 2nd one to play (on top of the 1st) after the 1st is completed, and then the 3rd clip to play (on top of the 2nd) after the 2nd clip is completed.

Each movie clip fades in so it is essential to have the clip fade in on top of the previous clip instead of a white bg.

And then I need it to loop, having the 1st clip play on top of the previous 3rd clip and so on…

Any actionscript advice would be greatly apprecaited, thank you!