Opening and closing a button

ive seen sites where you can click on the button than something opens up and when u clickon that somethign that opens up it goes away? where can i find the tutorial for this?? and whats the name of the effect? Any takers here??

I think you’ll find a few if you type in ‘flash+hierarchical menu+tutorial’ or ‘pop-up+flash+tutorial’ in google or something. If you cant I’ll see what I can find.