Moving around the buttons

Hi,

I have 3 buttons in my movie and description for each button in the right side box like in the diagram.

bt_about, bt_profile, bt_contact

Now when I click on about - the about button should move from the stage and profile and contact button should move to the first and second place with an easing movement.

Same in case I click on profile - the profile should move out of the stage and other 2 buttons should come to the first and second position with an easing movement.

I tried this with creating number of movie clips with each possibilities etc… but it is not going to happen…

I think their is a way with actionscript… If somebody knows please help me to do this…