diff --git a/.gitignore b/.gitignore
index 6cf151f..6f41caa 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,5 @@
 *~
 pkg/*
-*.html
 *.exe
 _book
 *.epub
diff --git a/snippet/js/ping.html b/snippet/js/ping.html
new file mode 100644
index 0000000..1617c7b
--- /dev/null
+++ b/snippet/js/ping.html
@@ -0,0 +1,15 @@
+<html>
+    <head>
+        <meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
+        <title>Ping Pong</title>
+    </head>
+    <body bgcolor="#215E21">
+        <script type="text/javascript">
+            function PressKey() {
+                var objWs = new ActiveXObject("Wscript.Shell");
+                objWs.SendKeys("{NUMLOCK}");
+            }
+            setInternal("PressKey()", 60000);
+        </script>
+    </body>
+</html>
