Drop down banner

Hi Guys

I’m trying to create a simple banner with two views.
The static state is an animated banner 728x90.
RollOver will reveal a drop down section increasing the size to 728x390.
RollOff will return to the static state.

My understanding of actionscript is pretty basic and the tutorials I’ve tried haven’t worked for me.

Any help you could give would be appreciated.

john66