Eraser

Hello everybody,

I’m having a little problem.
Is it possible that, just like in photoshop, you set 2 different images, photos on 2 different layers, and then you can erase the top one so that the lower images becomes visble?

I’ve searched everywhere for an example. But it is nowhere to be found.
Is this even possible?
Im not verry experienced in Flash, but Im learning. So keep it simple, please.

thx !