code review 1008042: godoc: add codewalk support

lib/godoc/codewalk.html

 <!--
         Copyright 2010 The Go Authors. All rights reserved.
         Use of this source code is governed by a BSD-style
         license that can be found in the LICENSE file.
-
-TODO BEFORE REVIEW: HTML escaping
-
 -->
 
-<script type='text/javascript' src='http://jqueryjs.googlecode.com/files/jquery-1.3.2.min.js'></script>
+<script src="http://www.google.com/jsapi"></script>
+<script>google.load("jquery", "1.3.2");</script>
 <style type='text/css'>@import "/doc/codewalk/codewalk.css";</style>
 <script type="text/javascript" src="/doc/codewalk/codewalk.js"></script>
 
 <div id="codewalk-main">
   <div class="left" id="code-column">
     <div id='sizer'></div>
     <div id="code-area">
       <div id="code-header" align="center">
         <a id="code-popout-link" href="" target="_blank">
           <img title="View code in new window" alt="Pop Out Code" src="popout.png" style="display: block; float: right;"/>
@@ skipping 30 matching lines @@
       </div>
       {.end}
     </div>
     <div id="comment-options" class="setting">
       <a id="prev-comment" href="#"><span class="hotkey">p</span>revious step</a>
       &bull;
       <a id="next-comment" href="#"><span class="hotkey">n</span>ext step</a>
     </div>
   </div>
 </div>