diff --git a/hledger-lib/Hledger/Data/Amount.hs b/hledger-lib/Hledger/Data/Amount.hs
index b79ac015f..69121c976 100644
--- a/hledger-lib/Hledger/Data/Amount.hs
+++ b/hledger-lib/Hledger/Data/Amount.hs
@@ -75,6 +75,7 @@ module Hledger.Data.Amount (
   mixed,
   amounts,
   filterMixedAmount,
+  filterMixedAmountByCommodity,
   normaliseMixedAmountPreservingFirstPrice,
   normaliseMixedAmountPreservingPrices,
   -- ** arithmetic
@@ -429,6 +430,17 @@ amounts (Mixed as) = as
 filterMixedAmount :: (Amount -> Bool) -> MixedAmount -> MixedAmount
 filterMixedAmount p (Mixed as) = Mixed $ filter p as
 
+-- | Return an unnormalised MixedAmount containing exactly one Amount
+-- with the specified commodity and the quantity of that commodity
+-- found in the original. NB if Amount's quantity is zero it will be
+-- discarded next time the MixedAmount gets normalised.
+filterMixedAmountByCommodity :: Commodity -> MixedAmount -> MixedAmount
+filterMixedAmountByCommodity c (Mixed as) = Mixed as'
+  where
+    as' = case filter ((==c) . acommodity) as of
+            []   -> [nullamt{acommodity=c}]
+            as'' -> [sum as'']
+
 -- | Convert a mixed amount's component amounts to the commodity of their
 -- assigned price, if any.
 costOfMixedAmount :: MixedAmount -> MixedAmount
diff --git a/hledger-lib/Hledger/Reports/TransactionsReports.hs b/hledger-lib/Hledger/Reports/TransactionsReports.hs
index f8528a4ef..48730c166 100644
--- a/hledger-lib/Hledger/Reports/TransactionsReports.hs
+++ b/hledger-lib/Hledger/Reports/TransactionsReports.hs
@@ -11,9 +11,12 @@ a some base account.  They are used by hledger-web.
 module Hledger.Reports.TransactionsReports (
   TransactionsReport,
   TransactionsReportItem,
+  triOrigTransaction,
   triDate,
+  triAmount,
   triBalance,
-  triSimpleBalance,
+  triCommodityAmount,
+  triCommodityBalance,
   journalTransactionsReport,
   accountTransactionsReport,
   transactionsReportByCommodity
@@ -51,11 +54,12 @@ type TransactionsReportItem = (Transaction -- the original journal transaction,
                               ,MixedAmount -- the running balance for the current account(s) after this transaction
                               )
 
-triDate (t,_,_,_,_,_) = tdate t
+triOrigTransaction (torig,_,_,_,_,_) = torig
+triDate (_,tacct,_,_,_,_) = tdate tacct
 triAmount (_,_,_,_,a,_) = a
 triBalance (_,_,_,_,_,a) = a
-triSimpleBalance (_,_,_,_,_,Mixed a) = case a of [] -> "0"
-                                                 (Amount{aquantity=q}):_ -> show q
+triCommodityAmount c = filterMixedAmountByCommodity c  . triAmount
+triCommodityBalance c = filterMixedAmountByCommodity c  . triBalance
 
 -------------------------------------------------------------------------------
 
@@ -237,9 +241,5 @@ filterTransactionsReportByCommodity c (label,items) =
         go bal ((t,t2,s,o,amt,_):is) = (t,t2,s,o,amt,bal'):go bal' is
           where bal' = bal + amt
 
--- | Filter out all but the specified commodity from this amount.
-filterMixedAmountByCommodity :: Commodity -> MixedAmount -> MixedAmount
-filterMixedAmountByCommodity c (Mixed as) = Mixed $ filter ((==c). acommodity) as
-
 -------------------------------------------------------------------------------
 
diff --git a/hledger-web/Foundation.hs b/hledger-web/Foundation.hs
index 42570b1d5..06c6cc185 100644
--- a/hledger-web/Foundation.hs
+++ b/hledger-web/Foundation.hs
@@ -134,6 +134,7 @@ instance Yesod App where
             addScript $ StaticR js_jquery_hotkeys_js
             addScript $ StaticR js_jquery_flot_min_js
             addScript $ StaticR js_jquery_flot_time_min_js
+            addScript $ StaticR js_jquery_flot_tooltip_min_js
             toWidget [hamlet| \<!--[if lte IE 8]> <script type="text/javascript" src="@{StaticR js_excanvas_min_js}"></script> <![endif]--> |]
             addStylesheet $ StaticR hledger_css
             addScript $ StaticR hledger_js
diff --git a/hledger-web/Handler/RegisterR.hs b/hledger-web/Handler/RegisterR.hs
index 08c8c848b..36105d0b9 100644
--- a/hledger-web/Handler/RegisterR.hs
+++ b/hledger-web/Handler/RegisterR.hs
@@ -4,6 +4,7 @@ module Handler.RegisterR where
 
 import Import
 
+import Data.List
 import Data.Maybe
 import Safe
 
@@ -105,31 +106,69 @@ registerChartHtml percommoditytxnreports =
 <div#register-chart style="width:85%; height:150px; margin-bottom:1em; display:block;">
 <script type=text/javascript>
  \$(document).ready(function() {
-   var chartdiv = $('#register-chart');
-   if (chartdiv.is(':visible')) {
+   var $chartdiv = $('#register-chart');
+   if ($chartdiv.is(':visible')) {
      \$('#register-chart-label').text('#{charttitle}');
-     registerChart(
-       chartdiv,
-       [
-         $forall (comm,(_,items)) <- percommoditytxnreports
-          {
-           data: [
-             $forall i <- reverse items
-              [#{dayToJsTimestamp $ triDate i}, #{triSimpleBalance i}],
-             /* [] */
+     var seriesData = [
+      $forall (c,(_,items)) <- percommoditytxnreports
+       /* we render each commodity using two series: 
+        * one with extra data points added to show a stepped balance line */
+       {
+        data: [
+          $forall i <- reverse items
+           [
+            #{dayToJsTimestamp $ triDate i},
+            #{simpleMixedAmountQuantity $ triCommodityBalance c i},
            ],
-           label: '#{comm}',
-           color: #{colorForCommodity comm},
-          },
-       ]
-     );
+          /* [] */
+        ],
+        label: '#{c}',
+        color: #{colorForCommodity c},
+        lines: {
+          show: true,
+          steps: true,
+        },
+        points: { 
+          show: false,
+        },
+        clickable: false,
+        hoverable: false,
+       },
+       /* and one with the original data, showing one clickable, hoverable point per transaction */
+       {
+        data: [
+          $forall i <- reverse items
+           [
+            #{dayToJsTimestamp $ triDate i},
+            #{simpleMixedAmountQuantity $ triCommodityBalance c i},
+            '#{show $ triCommodityAmount c i}',
+            '#{show $ triCommodityBalance c i}',
+            '#{concat $ intersperse "\\n" $ lines  $ show $ triOrigTransaction i}',
+           ],
+          /* [] */
+        ],
+        label: '',
+        color: '#{colorForCommodity c}',
+        lines: {
+          show: false,
+        },
+        points: { 
+          show: true,
+          color: '#{colorForCommodity c}',
+        },
+       },
+     ]
+     var plot = registerChart($chartdiv, seriesData);
+     \$chartdiv.bind("plotclick", registerChartClick);
    };
  });
 |]
+           -- [#{dayToJsTimestamp $ ltrace "\ndate" $ triDate i}, #{ltrace "balancequantity" $ simpleMixedAmountQuantity $ triCommodityBalance c i}, '#{ltrace "balance" $ show $ triCommodityBalance c i}, '#{ltrace "amount" $ show $ triCommodityAmount c i}''],
  where
    charttitle = case maybe "" (fst.snd) $ headMay percommoditytxnreports
            of "" -> ""
               s  -> s++":"
    colorForCommodity = fromMaybe 0 . flip lookup commoditiesIndex
    commoditiesIndex = zip (map fst percommoditytxnreports) [0..] :: [(Commodity,Int)]
+   simpleMixedAmountQuantity = maybe 0 aquantity . headMay . amounts
 
diff --git a/hledger-web/static/hledger.js b/hledger-web/static/hledger.js
index 792160db6..f4190f4b9 100644
--- a/hledger-web/static/hledger.js
+++ b/hledger-web/static/hledger.js
@@ -32,65 +32,97 @@ $(document).ready(function() {
 // REGISTER CHART
 
 function registerChart($container, series) {
-	// https://github.com/flot/flot/blob/master/API.md
-	return $container.plot(
+  // https://github.com/flot/flot/blob/master/API.md
+  return $container.plot(
     series,
     { /* general chart options */
-      series: {
-        points: { 
-          show: true,
-        },
-        lines: {
-          show: true,
-          steps: true,
-        },
-        bars: {
-          // show: true,
-          // barWidth: 1000 * 60 * 60, // ms
-        },
-      },
-      yaxis: {
-        /* mode: "time", */
-        /* timeformat: "%y/%m/%d", */
-        /* ticks: 6, */
-      },
+      // series: {
+      // },
+      // yaxis: {
+      //   /* ticks: 6, */
+      // },
       xaxis: {
         mode: "time",
         timeformat: "%Y/%m/%d"
         /* ticks: 6, */
       },
       grid: {
-        // clickable: true,
-        // hoverable: true,
-        // autoHighlight: true,
         markings:
          function (axes) {
-          // console.log(axes);
-          // var markings = [];
-          // for (var x = Math.floor(axes.xaxis.min); x < axes.xaxis.max; x += 2)
-          //   markings.push({ xaxis: { from: x, to: x + 1 } });
-          // midx = Math.floor(axes.xaxis.min + (axes.xaxis.max - axes.xaxis.min) / 2);
-					var now = Date.now();
+          var now = Date.now();
           var markings = [
+            // {
+            //   xaxis: { to: now },        // past
+            //   yaxis: { from: 0, to: 0 }, // =0
+            //  color: '#d88',
+            //  lineWidth:1
+            // },
             {
-              xaxis: { from: now, to: now }, 
-							color: '#888',
-							lineWidth:1
+              xaxis: { to: now }, // past
+              yaxis: { to: 0 },   // <0
+              color: '#ffdddd',
+            },
+
+            // {
+            //   xaxis: { from: now, to: now }, // now
+            //  color: '#bbb',
+            // },
+
+            {
+              xaxis: { from: now }, // future
+              yaxis: { from: 0 },   // >0
+              // color: '#dddddd',
+              color: '#e0e0e0',
             },
             {
-              yaxis: { from: 0, to: 0 },
-							color: '#bb0000',
-							lineWidth:1
+              xaxis: { from: now }, // future
+              yaxis: { to: 0 },     // <0
+              // color: '#ddbbbb',
+              color: '#e8c8c8',
+            },
+            {
+              // xaxis: { from: now },      // future
+              yaxis: { from: 0, to: 0 }, // =0
+              color: '#bb0000',
+              lineWidth:1
             },
           ];
           // console.log(markings);
           return markings;
-        }
+        },
+        hoverable: true,
+        autoHighlight: true,
+        clickable: true,
+      },
+      /* https://github.com/krzysu/flot.tooltip */
+      tooltip: true,
+      tooltipOpts: {
+        xDateFormat: "%Y/%m/%d",
+        content:
+          function(label, x, y, flotitem) {
+            var data = flotitem.series.data[flotitem.dataIndex];
+            return data[3]+" balance on %x after "+data[2]+" posted by transaction:<pre>"+data[4]+"</pre>";
+          },
+        onHover: function(flotitem, $tooltipel) {
+          $tooltipel.css('border-color',flotitem.series.color);
+        },
       },
     }
   ).data("plot");
 }
 
+function registerChartClick(ev, pos, item) {
+  if (item) {
+    var date = $.plot.dateGenerator(item.datapoint[0], {});
+    var dateid = $.plot.formatDate(date, '%Y-%m-%d');
+    $target = $('#'+dateid);
+    if ($target.length)
+      $('html, body').animate({
+        scrollTop: $target.offset().top
+      }, 1000);
+  }
+}
+
 //----------------------------------------------------------------------
 // ADD FORM