JavaScript: Getter/Setter Properties with native JavaScript

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The following is a rudimentary 'iterator' (not to be confused with JavaScript 1.7 iterator) that contains 'next' and 'previous' getter properties that range between 0 and 100, and the 'force' setter forces the iterator's value.
  <script>
  var I = {
  get next() {
  return this.counter < 100 ? ++this.counter : this.counter;
  },
  get previous() {
  return this.counter > 0 ? --this.counter : this.counter;
  },
  set forced(c) {
  this.counter = c;
  },
  counter: 0
  }

  alert(I.next);
  alert(I.previous);
  I.forced = 4;
  alert(I.next);
  //obviously there's no member hiding in this context, so you could even set I.counter = 4, however this setter could be home to data sanitization etc.
  </script>