diff --git a/templates/coal/graph.tmpl b/templates/coal/graph.tmpl
--- a/templates/coal/graph.tmpl
+++ b/templates/coal/graph.tmpl
@@ -54,8 +54,8 @@
document.getElementById('noscript').style.display = 'none';
-data = {jsdata|json};
-graph = new Graph();
+var data = {jsdata|json};
+var graph = new Graph();
graph.scale({bg_height});
graph.edge = function(x0, y0, x1, y1, color) {
diff --git a/templates/gitweb/graph.tmpl b/templates/gitweb/graph.tmpl
--- a/templates/gitweb/graph.tmpl
+++ b/templates/gitweb/graph.tmpl
@@ -46,8 +46,8 @@ graph |
document.getElementById('noscript').style.display = 'none';
-data = {jsdata|json};
-graph = new Graph();
+var data = {jsdata|json};
+var graph = new Graph();
graph.scale({bg_height});
graph.edge = function(x0, y0, x1, y1, color) {
diff --git a/templates/graph.tmpl b/templates/graph.tmpl
--- a/templates/graph.tmpl
+++ b/templates/graph.tmpl
@@ -4,6 +4,7 @@
href="#url#atom-tags" title="Atom feed for #repo|escape#: tags">
+
@@ -39,8 +40,8 @@ navigate: #chang
document.getElementById('noscript').style.display = 'none';
-data = {jsdata|json};
-graph = new Graph();
+var data = {jsdata|json};
+var graph = new Graph();
graph.scale({bg_height});
graph.edge = function(x0, y0, x1, y1, color) {