Elasticity on the return of dragable buttons

I have made a dragable button that you can move around and that returns to the starting place when you let go. I would like to add the elastic effect seen in this site. (drag the jar in the top right corner and let go)

http://zelda.com/minishcap/launch/index.html

Its also a nice flash site with good interactivity. Thanks for your time!

Ithaca

Heres the fla. in MX