es group only</li>
                    </ul>
                    <div class="del"></div>
                    <div class="node-collapse"></div>
                    <div id="c3_1" class="w" style="left:30px;top:35px">3.1</div>
                    <div id="c3_2" class="w" style="left:80px;top:162px">3.2</div>
                </div>

                <!-- this group will be added to Group3 by the JS at load time -->
                <div class="group-container" id="container4" group="four">
                    <d