How can I expand the stage (in one direction) on rollover? Or click?

Hello,

I'm looking to create an expanding/collapsing HTML5 banner using Edge Animate.

For example, say I start with a 728x90 banner. How can I make the stage expand (from the bottom edge) to 728x270?

At the moment I'm looking to expand on rollover then collapse back to original stage size on rollout - but in the future I know I'll want the same functionality using a button.

All help is appreciated, thank you!