public ActionForward readAlertMessage(ActionMapping mapping, ActionForm form, HttpServletRequest request,
HttpServletResponse response) {
PhdAlertMessage alertMessage = getAlertMessage(request);
alertMessage.markAsReaded(getLoggedPerson(request));
// back information
String unread = (String) getFromRequest(request, "unread");
String global = (String) getFromRequest(request, "global");
String archive = (String) getFromRequest(request, "archive");