Содержимое ифрейма

gistfile1.html

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<h2>inner</h2>

<script>
jQuery(function() {
  if ('parent' in window && window != window.parent && 'postMessage' in window.parent) {
    window.parent.postMessage('page_change:20', '*');
  }
});
$(window).bind('message', function(e) {
  $(document.body).append('<h2>remote message from '+e.originalEvent.origin+': "'+e.originalEvent.data+'"</h2>');

  var css_match = e.originalEvent.data.match(/^include_stylesheet:(.*)$/)
  if (css_match.length == 2) {
    var tag = document.createElement('link');
    tag.href = css_match[1];
    tag.setAttribute('media', 'screen');
    tag.setAttribute('type', 'text/css');
    tag.setAttribute('rel', 'stylesheet');
    var s = document.getElementsByTagName('script')[0];
    s.parentNode.insertBefore(tag, s);
  }
});
</script>