Event-weiterleiten geht nicht

Versuch es einfach mal so:
HTML:
<!DOCTYPE html>
<html>
<head>
  <title>webseite</title>
  <script type="application/javascript">
    if(!window.addEventListener) {
      if(window.attachEvent) {
        window.addEventListener = function (event, callback) {
          window.attachEvent('on' + event, callback);
        }
      } else {
        window.addEventListener = function (event, callback) {
          window['on' + event] = callback;
        }
      }
    }
    
    window.addEventListener('load', function () {
      alert(!!window.handleEvent);
    }, false);
  </script>
</head>
<body>
</body>
</html>
 
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