<%= render_list :class => "nav" do |li| 
          li << link_to("首页", root_path)
          li << link_to("社区", topics_path)
          li << link_to("新闻", news_index_path)
%>

如果我想实现

<li class="active">
        <%= link_to cpanel_topics_path do %>
          <div>
            <div class="ico">
              <%= image_tag("cpanel/ico-notification.gif") %>
            </div>
            <div class="title">社区</div>
          </div>
          <div class="arrow">
            <div class="bubble-arrow-border"></div>
            <div class="bubble-arrow"></div>
          </div>
        <% end %>
      </li>

应该要怎么做？