app/views/shared/categories_menu.html.erb
<ul id="cat_menu">
<% @environment.display_categories.each do |item| %>
<li id="category<%= item.display_color %>"<%= ' class="active"' if (@category && (@category.top_ancestor == item)) %>>
<%= item.name %>
<ul>
<% item.children_for_menu.each do |child| %>
<li><%= link_to(content_tag('span', child.name), :controller => 'search', :action => 'category_index', :category_path => child.explode_path) %></li>
<% end %>
</ul>
</li>
<% end %>
</ul><!-- fim id="cat_menu" -->