"Access denied" to iframe in IE

"Access denied" to iframe in IE

I'm trying to use hasnchange plugin writen by Ben Alman but have a problem when i using it in IE.
Code:
fake_onhashchange = (function(){
    var self = {}, timeout_id, set_history, get_history, iframe, c, i;
     
      c = $('#page');
      i = $(document.createElement('iframe')).attr({'id': 'location-iframe', 'name': 'location-iframe', 'height': 50, 'src': '/iframe.html'});
     
      c.append(i.load(function(){ iframe = this.contentWindow; }));
   
    // Initialize. In IE 6/7, creates a hidden Iframe for history handling.
    function init(){
      // Most browsers don't need special methods here..
      set_history = get_history = function(val){ return val; };
     
      // But IE6/7 do!
      if ( is_old_ie ) {
       
        // Create hidden Iframe after the end of the body to prevent initial
        // page load from scrolling unnecessarily.
        // Get history by looking at the hidden Iframe's location.hash.
        get_history = function() {
          return get_fragment( iframe[ str_location ][ str_href ] );
        };
       
        // Set a new history item by opening and then closing the Iframe
        // document, *then* setting its location.hash.
        set_history = function( hash, history_hash ) {
          if ( hash !== history_hash ) {
            var doc = iframe.document;           
            doc[ str_location ].hash = '#' + hash; //In this place IE throws Access Denied error
          }
        };
       
        // Set initial history.
        set_history( get_fragment() );
      }
    };
iframe.html



































:
<html>
<head>
<script type="text/javascript">
    document.domain = 'some.net'; // as in parent window
</script>
</head>
<body>
   
</body>
</html>