Facebook Connect JavaScript API - friends_get never returns from callback on ie6?

Question

The following code works on all browsers that I've seen so far other than IE6, which gives me no javascript errors or anything but never calls the callback to friends_get. I would have expected that if facebook's javascript code for this was just broken on IE6 i would have been able information about that on the internet, am I just doing something terribly wrong?

FB.init('77777777777777777777777777777777', '/facebook/xd_receiver.htm');
alert('post-init');
FB.ensureInit(function(){
    alert('in ensure init, calling require session');
    FB.Connect.requireSession(function(){
        alert('in require session, calling friends_get');
        FB.Facebook.apiClient.friends_get(null, function(friends_ids) {
            if (friends_ids) {
                alert('got friends: '+friends_ids.join(', '));
            } else {
                alert('got no friends :(');
            }
        });
    }, function(){
        alert('login fail');
    }, true);
    alert('after require session block');
});