var userButton = me.GUI_Object.extend({
      init: function(image, x, y, z, goToState) {
        var settings = {};
        settings.image = image;
        this._super(me.GUI_Object, "init", [x, y, settings]);
        this.pos.z = z;
        this.goToState = goToState;
      },
      onClick: function(event) {
        me.state.change(this.goToState);
        // don't propagate the event
        return false;
      },
      onOver: function(event){
        document.body.style.cursor = "pointer";
      },
      onOut: function(event){
        document.body.style.cursor = "default";
      },
    });