var makeBlinkyDancer = function(top, left, timeBetweenSteps) {
  var blinkyDancer = makeDancer(top, left, timeBetweenSteps);

  // we plan to overwrite the step function below, but we still want the superclass step behavior to work,
  // so we must keep a copy of the old version of this function

  var oldStep = blinkyDancer.step;

  blinkyDancer.step = function() {
    // call the old version of step at the beginning of any call to this new version of step
    // toggle() is a jQuery method to show/hide the <span> tag.
    // See for this and
    // other effects you can use on a jQuery-wrapped html tag.

  return blinkyDancer;