docs: function(p) {
  
              var self = this;
  
              if (!p) return;
              if (!p.parent) return;
  
              //console.log("zoom out p.value = " + p.parent.value);
              //console.log("zoom out p.name = " + p.parent.name);
              //console.log(p.parent);
              self.updateExplanation(p.parent.sum, p.parent.name);
  
              self.zoom(p.parent, p);
          }