*/
UrlRenderer renderer = getRequestCycle().getUrlRenderer();
Url oldBase = renderer.getBaseUrl();
Url action = Url.parse(getActionUrl().toString());
renderer.setBaseUrl(action);
url = renderer.renderUrl(Url.parse(url.toString()));
renderer.setBaseUrl(oldBase);
Form<?> root = getRootForm();
return new AppendingStringBuffer("document.getElementById('").append(
root.getHiddenFieldId())