HELP w/easing in AS3

I’m totally AS3 newbie, but stuck with this small project where I must use AS3. I’m just trying to put a small tab (tab.mc) on the corner of existing flash interface (480x320) - where the visitor can click or rollover the tab to have a hidden movie clip to slide out for view… kinda like a hidden ad type. How do I go about doing this in AS3? Any help would be appreciated.