Invisible buttons

Hey…
can someone help me learn how to make invisible buttons, like when you put your cursor over the button, sub buttons come down?

actions of frame 1
stop()

actions script of main buttons
on ([COLOR=royalblue]rollOver[/COLOR]) {
gotoAndStop([COLOR=red]x[/COLOR]);
}

make the sub buttons into a movieclip
place the movie clip to frame [COLOR=red]x[/COLOR]

hopefully u’ll understand what i have just explained…
^^


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