Hopping Medicine Box

I've got to start playing with animation, so I've created this animated gif of a box of medicine,  umm...running? Or hopping? Either way, it's a moving picture.

I've been meaning to mess around with animation for awhile now, and now that school's out, it's the perfect time to animate whatever and do whatever without worrying about attaching a silly story along with it.

I know it's a pretty crappy animated thing, but I've got to animate something, you know. I don't want to be super rusty.