anchor.diff:          h4 Rating History
           #rating-chart: canvas
           #rating-tooltip
  -            a.contest
  +            .contest
               .date
               .rating
   
  
positive.code:                             var item = rating_history[data_index[elements[0].arg.toString() + ',' + elements[0].value.toString()]];
                              var offset = elements[0].tooltipPosition();
  
                              var contest = $tooltip.find('.contest');
                              contest.attr("href", item.link);
                              contest.text(item.label);
                              $tooltip.find('.date').text(item.date);
                              $tooltip.find('.rating').text(item.rating);
  
  
negative.code:                     pointDotRadius: 6,
                      pointHitDetectionRadius: 8
                  });
                  
                  $canvas.click(function(evt) {
                      var activePoints = window.rating_chart.getPointsAtEvent(evt);
                      if (activePoints.length > 0) {
                          var item = rating_history[data_index[elements[0].arg.toString() + ',' + elements[0].value.toString()]];
                          window.location.href = item.link;
                      }
                  });
              });
  