Queue.js

/*global setTimeout */
var Queue = function Queue(q) {
  "use strict";
  // (C) WebReflection - Mit Style License
  var callback,
    next = function next() {
      callback = q.shift();
      if (callback) { callback(q); }
      return !!callback;
    };

  q.wait = function wait(condition, delay) {
    if (condition || callback) { q.unshift(callback); }
    q.next = next;
    setTimeout(next, delay || 0);
  };
  q.wait(1);
  return q;
};