gkcounter.js

(function (window, n) {
  'use strict';
  var storage = window.localStorage;
  var count = parseInt(storage.getItem('gkcounter'), 10) || 0;

  if (count >= n) {
    alert('Create a new instance of gesturekit');
    return;
  }

  count += 1;
  storage.setItem('gkcounter', count);

}(this, 5));