code: function (color, width) {
          if (!color) {
              color = "red";
          }
          if (!width) {
              width = 2;
          }
          this.div.style.border = width + "px solid " + color;
      }
docs: Method: setBorder
  Allow the user to change the box's color and border width
  
  Parameters:
  color - {String} Default is "red"
  width - {int} Default is 2