Mouse over event listener? in Flash CS4 (AS3)

Hi,
I was wondering if there is such a thing as a mouse over listener.
So that it would execute code when the mouse rolls over(and maybe also execute code when the mouse moves away again)
Thank you for any help.

yes, there are mouseover and rollover events, as well as, their "out" events:
MouseEvent.MOUSE_OVER
MouseEvent.ROLL_OVER

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