code: function (/* event */) {
          if (this.isMute) {
              me.audio.unmuteAll();
              this.setRegion(game.texture.getRegion("shadedDark13.png"));
              this.isMute = false;
          } else {
              me.audio.muteAll();
              this.setRegion(game.texture.getRegion("shadedDark15.png"));
              this.isMute = true;
          }
          return false;
      }
docs: function called when the object is clicked on