Forum Moderators: phranque
Yahoo has some messy code in there. Probably deliberate, to keep people like us from figuring out how to mimic them. ha!
The ad is Flash, which means it can trigger javascript events on the page with FSCommands. So when the movie reaches Frame X, the movie tells the page to start that DHTML routine that changes the (CSS) height of the element it's in.
The column below the ad just rides along as the height changes. I don't think it's positioned up or down.
If you want to mimic this, then you can experiment with the getUrl Flash command:
getUrl("javascript:startAnim()");
// where startAnim() is a function in your javascript