anchor.diff:                                         JobTracker tracker) throws IOException {
       Collection c;
       if (("blacklisted").equals(type)) {
  +      out.println("<h2>Blacklisted Task Trackers</h2>");
         c = tracker.blacklistedTaskTrackers();
       } else if (("active").equals(type)) {
  +      out.println("<h2>Active Task Trackers</h2>");
         c = tracker.activeTaskTrackers();
       } else {
  +      out.println("<h2>Task Trackers</h2>");
         c = tracker.taskTrackers();
       }
       if (c.size() == 0) {
  
positive.code: <body>
  <h1><a href="jobtracker.jsp"><%=trackerName%></a> Hadoop Machine List</h1>
  
  <h2>Task Trackers</h2>
  <%
    generateTaskTrackerTable(out, type, tracker);
  %>
  
  <%
  
negative.code:     }
    }
  
    public void generateTableForExcludedNodes(JspWriter out, JobTracker tracker) 
    throws IOException {
      // excluded nodes
      out.println("<h2>Excluded Nodes</h2>");
      Collection<String> d = tracker.getExcludedNodes();
      if (d.size() == 0) {
        out.print("There are currently no excluded hosts.");
      } else { 
        out.print("<center>\n");
        out.print("<table border=\"2\" cellpadding=\"5\" cellspacing=\"2\">\n");
        out.print("<tr>");
        out.print("<td><b>Host Name</b></td></tr>\n");
        for (Iterator it = d.iterator(); it.hasNext(); ) {
          String dt = (String)it.next();
          out.print("<td>" + dt + "</td></tr>\n");
        }
        out.print("</table>\n");
        out.print("</center>\n");
      }
    }
  %>
  
  <html>
  