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      // Helper function to show/hide noise level widget.

      var noise_level_shower = function(speed) {

        speed = (typeof speed == 'undefined') ? 'slow' : speed;

          $(".form-item-image-captcha-noise-level").show(speed);

        } else {

          $(".form-item-image-captcha-noise-level").hide(speed);

        }

      // Add onclick handler to the dot and line noise check boxes.

      $("#edit-image-captcha-dot-noise").click(noise_level_shower);

      $("#edit-image-captcha-line-noise").click(noise_level_shower);

        } else {

          $(".form-item-image-captcha-bilinear-interpolation").hide(speed);

        }

      // Add onchange handler to the distortion level select widget.

      $("#edit-image-captcha-distortion-amplitude").change(

          smooth_distortion_shower);

      // Show or hide appropriately on page load.

    }

  };