function doCommentRefresh(url) {
  var refresh_comments = {
    success : function(o) {
      var json = eval("(" + o.responseText + ")");
      document.getElementById("comments").innerHTML = json['html'];
      parent.tl.refresh();
    },

    failure : function(o) { console.log("XHR failed: " + o.responseText); }
  };

  var formObject = document.getElementById('comment'); 
  YAHOO.util.Connect.setForm(formObject); 
  YAHOO.util.Connect.asyncRequest('POST', url, refresh_comments, null);
}