Animating flat 2D graphic

Can anyone help me figure out how to animate a 2D graphic? It’s paper thin, and the legs and antenna are separate pieces for movement, and the body is one piece. It’s very simple, just want it to do a small walk, maybe 15 - 20 frames.

I’ve tried to do two ways. First was timeline using loc/rot. Second I tried to create bones, and bone heat, and use pose mode. Both failed.

Any better way of doing this?


See this
http://blenderartists.org/forum/showthread.php?t=77196&page=1

Thank you!