 if ((tindex % 4) == 0) {
              write_graphs_header_row();
            }
            test = test_list[tindex];
            test_name = test_map[test];
            document.write('<tr>');
            url = MakeURL({'test':escape(test)});
            document.write('<th valign="center"><a href="' + url + '">'
                           + test_name + '</a></th>');
            for (var bindex=0; bindex < builder_list.length; bindex++) {
              builder = builder_list[bindex];
              builder