diff --git a/index.html b/index.html
index 414ae63..ebd9acf 100644
--- a/index.html
+++ b/index.html
@@ -103,9 +103,12 @@
         });
       },
       slide: function (event, ui) {
-        // ToDo: handle year change
-        var curweek = ui.value;
-        var curyear = year;
+        var cur_date = new Date();
+        var week = cur_date.getWeek();
+        var delta = parseInt(ui.value) - week;
+        cur_date.setDate(cur_date.getDate() + 7 * delta);
+        var curweek = cur_date.getWeek();
+        var curyear = cur_date.getFullYear();
         if (map.hasLayer(markerLayer)) {
           markerLayer.clearLayers();
         }