if (!window.addEvent) {
  function addEvent(obj, type, fn) {
    if (obj.attachEvent) {
      obj['e'+type+fn] = fn;
      obj[type+fn] = function() { obj['e'+type+fn](window.event); }
      obj.attachEvent('on'+type, obj[type+fn]);
    }
    else
      obj.addEventListener(type, fn, false);
  }
}