Want to give buttons a bit more life (wobble)

Hi,

I would like a bit of script that I could attach to some buttons so it looks like they are wobbling slighty on roll over.

The atached jpeg shows the basic design of them - opaque with shadows.

I would like the movement to be random, i can programme it already to move up and down or whatever, but not so its a differnt movement every time.

Can you help?