function addLoadListener(fn) {
  if (typeof window.addEventListener != 'undefined')  {
    window.addEventListener('load', fn, false);
  }
  else if (typeof document.addEventListener != 'undefined')  {
    document.addEventListener('load', fn, false);
  }
  else if (typeof window.attachEvent != 'undefined')  {
    window.attachEvent('onload', fn);
  }
  else  {
    var oldfn = window.onload;
    if (typeof window.onload != 'function') {
      window.onload = fn;
    }
    else {
      window.onload = function() {
        oldfn();
        fn();
      };
    }
  }
}