button animation on mouseover and mouse out?

hi, i have a simple animation on my button when the mouse rolls over it and i want it to play in reverse when the user takes the mouse away from the button.
how can i do this, im sure it must be quite easy?

thx muchly :D
lev

Butons can not sidplay animation on rollOut.

You have to make a movieclip with your animations and then control what it should play with some actions ON the movieclip.

onClipEvent(load){
// Play normal animation
this.onRollOver=function(){
gotoAndPlay(2);
}
// Play the backward animation
this.onRollOut=function(){
gotoAndPlay(21);
}
}