Decreasing size of object on(Press)

I have a movie that, when a button is pressed, a specific movieclip (named revealbar) moves a certain increment (in this case 25 pixels):


on(press){
    gotoAndStop(2);
    _root.revealbar._x = _root.revealbar._x+25;
}

What I’d like to do is have the bar decrease in size instead of just move. Does anyone know how that is achieved?