function showCookie(resp) {
  var cookieMessage = resp.responseXML.documentElement.firstChild.nodeValue;
  var textNode = document.createTextNode(cookieMessage);
  var htmlElement = document.getElementById('fortuneMessage');

  if (htmlElement.hasChildNodes()) {
          htmlElement.replaceChild(textNode,htmlElement.firstChild);
  } else {
          htmlElement.appendChild(textNode);
  }

}