public ActionForward modify(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) {
String url="modifyno";
TbGroup TbGroup = (TbGroup) form;
TbGroup.setTbUsers((TbUsers)(request.getSession().getAttribute("user")));
if(new TbGroupDAO().attachDirty(TbGroup)){
url="modifyok";
}
return mapping.findForward(url);
}