Here, I’m not boasting or anything but look at the buttons on the top of my page and tell me if this is what you are talking about? I did my buttons as movieclips with a ‘dummy_button’ over the top of them for the actionscript (i.e. rollOver,rollOut etc). This way it gives you more options as to what you want your buttons to act like.
If this is not what you are looking for then disregard the above (and stop laughing at my site! ) and someone who knows what they are doing can help you.
This is the actionscript for the dummy button that acts as the hit area of my movieclip buttons. Maybe not the cleanest I like it better than trying to get button symbols to behave with something more than just up,down,over.
simply change y++ to y+=x and rather than increase by 1, it will increase y by however many x represents (eg. y+=5)
give your mc an instance name and use its path to activate it: easiest way, have a blank frame on first frame and have action stop() on it and then on your button use sumit like _root.myMC.play() wer myMC is the instance name you gave it… assuming your mc is on the main timeline