Collapse flash animation then shift page up

Hi,

I’ve seen this done before…just curious how to do it. Sometimes Yahoo has it on their site. There will be a Flash animation that’s 300 pixels tall then after it’s done playing it collapses up to around 50 pixels tall. Then the rest of the page below it shifts up to fill the space.

Are there any tutorials on this? I’ve been searching but to no luck. Maybe I’m not using the right search terms.

Any help would be much appreciated.

Thanks!