Ben2TheEdge,
Your example is much cooler than mine! Although the one I've posted is more schematic and easier to understand.
Genadino,
How come these examples are not going to help you? The one Ben has posted is quite close to what you need. You probably won't get it right the first time, but hey, who did? We're all here to learn. Try to study, understand the examples and improve your own animation, otherwise you probably won't get any help.
I know it's your problem. I've only mentioned it because if you animate only parts of the sprite you'll have to re-do a lot of stuff to blend it to the rest of the animated body. So, I just meant to help.
But if that's what you want, by all means, suit yourself.