Do you know how this is done?

programming flash
1

I’d like to learn how to make the callout popups like the one used at:
http://www.flashcfm.com/tutorials.cfm on the Tutorials page.

I know how to do the mouse over. What I don’t know is how to make the popup look like it folds open when you mouse over and fold close when the user mouses out.

Any ideas? Can you point me to a tutorial on this? An FLA I can learn from?

Thanks,
martin