Question regarding iframe and redirection

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd">
<title>test of iframe</title>
<iframe width="500" height="400" src="http://example.net/">
  <p><a href="http://example.net/">See The Example Site</a></p>
</iframe>
<script type="text/javascript">
        window.onload = function () {
                document.getElementsByTagName('iframe')[0].onload = function () {
                        window.alert('Document loaded in frame');
                }
        }
</script>