Mine

#
function lightOn() {
#
        this.onEnterFrame = function() {
#
                 this.bg4b_mc._alpha += 20;
#
                if(this.bg4b_mc._alpha >= 100){
#
                        this.bg4b_mc._alpha = 100;
                        delete this.onEnterFrame;
#
        }
#
}
#
       
#
function lightOff() {
#
        this.onEnterFrame = function() {
                this.bg4b_mc._alpha -= 10;
                if(this.bg4b_mc._alpha <=0){
#
//                  this.bg4b_mc._alpha = 0;
#
                        //this.bg4b_mc._visible = false;
#
                        delete this.onEnterFrame;
#
                }
#
        }
#
}