Need a piece of AS

1

ok, for example, I have this buttom that it´s black, when u rollover it turns red, I want to make it return to black when u stop the rollover, but from red to black…I don´t know if I explain myself, man I suck in english, hope u understand… what´s a possible AS for this, a simple one… I know there are some threads about this, but can find one, thanks