flags += "|" + elt.id;
        });
        return flags.substr(1);
      }

      function refreshChart() {
        if (!chartsReady) return;
        var container = $('#mmu_chart');
        container.css('opacity', '.5');
        refreshChart.count++;
        var seq = refreshChart.count;
        $.getJSON('?mode=plot&flags=' + mmuFlags())
         .fail(function(xhr, status, error) {