<% if actives.blank? %>
  <%= render :partial => 'target' %>
<% else %>
 <%= render :partial => 'active', :collection => actives %>
<% end %>
  <%= sortable_element "active", :url => {:action => 'set_active'},
     :tag => 'div',
     :handle => 'handle', :containment => ['active','available_box'],
     :loading => "new Element.show('update_spinner')" %>
