Adding anujb's calendar extension.

chrome/common/extensions/docs/examples/extensions/calendar/javascript/util.js

Index: chrome/common/extensions/docs/examples/extensions/calendar/javascript/util.js
diff --git a/chrome/common/extensions/docs/examples/extensions/calendar/javascript/util.js b/chrome/common/extensions/docs/examples/extensions/calendar/javascript/util.js
new file mode 100644
index 0000000000000000000000000000000000000000..1ad5ac69c58976ef2673fa9d5214582d9cf6117e
--- /dev/null
+++ b/chrome/common/extensions/docs/examples/extensions/calendar/javascript/util.js
@@ -0,0 +1,14 @@
+/**
+ * Copyright (c) 2010 The Chromium Authors. All rights reserved.  Use of this
+ * source code is governed by a BSD-style license that can be found in the
+ * LICENSE file.
+ */
+
+/**
+ * Alias for document.getElementById.
+ * @param {string} id The id of the element.
+ * @return {HTMLElement} The html element for the given element id.
+ */
+function $(id) {
+  return document.getElementById(id);
+};