anchor.diff:  <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);
  
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:        <% 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>
  