made tooltip smarter for when comparing

templates/index.html

@@ -261,7 +261,13 @@
                     plotBands: plotBands // Alternating background for years 
                 },
                 yAxis: { title: { text: 'Amount ($)' } },
-                tooltip: { pointFormat: '{point.x:%Y-%m-%d}: <b>{point.y:.2f}</b>' },
+                tooltip: { 
+                            pointFormatter: function () 
+                            { 
+                                if( this.series.symbol == 'circle' ) { s='\u25CF' } else { s='\u2B25' }
+                                return '<span style="color:' + this.point.color + '">' + s + '</span> <b>' + this.point.y + ':</b> ' + this.series.name + '<br>'
+                            }, shared:true 
+                        },
                 annotations: annotations, // Add annotations
                 series: [
                     { name: "Savings", data: chartData, marker: { radius: 2 } }