JavaScript - Quintus

Is someone able to give me simplest way to change the image?

stage.insert(new Q.UI.Button({
        asset:'picture.png',
        x: i,
        scale: 0.5,
        y: j,
        angle:0,
        Text:String(55)
        }, function() {
        this.add("tween");
        this.animate({ scale:0, angle:180},0.3,Q.Easing.Quadratic.In);
        //change image
        this.chain({ scale:0.5,angle:0 },0.3,Q.Easing.Quadratic.Out);