anchor.diff:         <% if( request.isUserInRole( Authentication.ROLE_ADMIN ) || !request.isUserInRole( Authentication.ROLE_READONLY ) ) { %>
              <td class="divider">
                <nobr>
  +               <% if ("true".equals(acknowledgeEvent)) { %>
                  <input type="checkbox" name="event" value="<%=event.getId()%>" />
  +               <% } %>
                  <a href="event/detail.jsp?id=<%=event.getId()%>"><%=event.getId()%></a>
                </nobr>
              </td>
  
positive.code:      <tr>
         <td class="standard" colspan="2">
           <%
           String acknowledgeEvent = System.getProperty("opennms.eventlist.acknowledge");
           if( (request.isUserInRole( Authentication.ROLE_ADMIN ) || !request.isUserInRole( Authentication.ROLE_READONLY )) && "true".equals(acknowledgeEvent)) { %>
             <nobr>
               <input type="button" value="Acknowledge" onclick="submitAck()">
  
negative.code: <table class="standard o-box">
  
  <%
     String acknowledgeEvent = System.getProperty("opennms.eventlist.acknowledge");
     for( int i=0; i < events.length; i++ ) {
         Event event = events[i];
         pageContext.setAttribute("event", event);
  