Here is my animation http://www.truploader.com/view/810687 I wanted to be like the, black guy apears behind of the rock ,and then he pushes blue guy off the rock ,but i dont know how to do it ,how to animate the motion. Can anyone help me with that? Just i dont know how to make it , when black guy comes out behind the rock ,i hope you understanded ,sorry for my bad english.
Please help me :)

place the layer with the black stickman behind the layer with the rock, this will make it appear as if he is acctually behind it, rather than popping out of it.

Yeah, make a new layer, and make the black stick on that layer. Make sure the layer is below the others if you want it to have that "behind" look.