--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/javascript/d3/src/core/transition-duration.js	Thu Apr 10 14:20:23 2014 +0200
@@ -0,0 +1,6 @@
+d3_transitionPrototype.duration = function(value) {
+  var groups = this;
+  return groups.each(typeof value === "function"
+      ? function(d, i, j) { groups[j][i].duration = +value.apply(this, arguments); }
+      : (value = +value, function(d, i, j) { groups[j][i].duration = value; }));
+};