How do I do this?

How should I start?:-\ I am new to flash… well not that new but I have lots of gaps in my action script:beam: Question: I’m making a button with an animation…it’s all ok… but when I hover out of the button it goes back in a snap to it’s up position…what do I want? I want the button to repeat in reverse the over animation when I roll out the mouse off the button… can I do that with just action script? can you give me an example that I can study(fla) or a piece of actionscript code??? I would really apreciate your help!!!

     Best regards, 
              PiXeLMunk