Tweener
From Wikicliki
Tweener is an actionscript class library which lets you make all sorts of amazing easing in and out animation effects.
My sample implemenation
import caurina.transitions.Tweener; invest_mc.onRollOver = function () { invest_mc.gotoAndPlay("open"); Tweener.addTween(save_mc, {_x:168.5, time:0.3, transition:"easeInOutExpo"}); Tweener.addTween(protect_mc, {_x:58.5, time:0.3, transition:"easeInOutExpo"}); }; invest_mc.onRollOut = function () { invest_mc.gotoAndPlay("close"); Tweener.addTween(save_mc, {_x:376.4, time:0.3, transition:"easeInOutExpo"}); Tweener.addTween(protect_mc, {_x:266.5, time:0.3, transition:"easeInOutExpo"}); }