Interdependent button control

programming flash
1

Another AS3 “newbie” challenge…the design:

  1.   I have three buttons aligned horizontally.

  2.   When clicked, a button visually eases up (say 10 pixels). 

  3.   Only one of the three buttons may be in the “up” position at any given time.  If any button is in the “up” position when another button is clicked, it will ease back into its original “down” position. It may not be directly returned to the "down" position by clicking it while in  the "up" position.

  4.   The leftmost button is initialized in the “up” position.

Can this be done simply, using AS3?
Thanks in advance!