They could use The Google 404 search widget thingie.

    <script type="text/javascript">
      var GOOG_FIXURL_LANG = 'en';
      var GOOG_FIXURL_SITE = 'http://www.google.com'
    </script>
    <script type="text/javascript"
    src="http://linkhelp.clients.google.com/tbproxy/lh/wm/fixurl.js>
    </script>