function myEvent(el, type, fn) {
  if (window.addEventListener) {
    myEvent = function(el, type, fn) {
      el.addEventListener(type, fn, false);
    };
  } else if (window.attachEvent) {
    myEvent = function(el, type, fn) {
      el.attachEvent("on" + type, fn);
    };
  }

  return myEvent(el, type, fn);
}