Text effect using movie clips as buttons. HELP!

hey all. first time posting. hope i get some feedback.

ok here goes. i have been using flash for awhile. but i see sites where they have several buttons that when you rollover one button, it will react a certain way, then when u roll off of it, it will go back to it’s original state, kind of like using reverse frames.

now, how do i do this? i heard that you can make a movie clip behave like a button, i have five books here and i can’t get what i want.

what i want to do is have text get bigger on the rollover state, stay like that until you roll off and then have the text sort of snap back to it’s original size. anyone know what to do? or any tutorials?

thanks again.
-pheevah