title: django request.user.is_superuser doesn't work
body: <p>I want to show a button if the user is a superuser. I've found  differents examples but my code doesn't work. The button doesn't appear. Anybody knows why?</p>
  
  <p>views.py</p>
  
  <pre><code>def inici(request):    
  zones = Zona.objects.all()    
  return render_to_response('principal/inici.html', dict(zones=zones),
      context_instance = RequestContext(request))
  </code></pre>
  
  <p>inici.html</p>
  
  <pre><code>{% if not user.is_authenticated %}
       ....
  {% else %}  
  &lt;ul&gt;                    
      &lt;li class="nivell1"&gt;
      &lt;a href="/accounts/logout/?next=/"&gt;Logout&lt;/a&gt; 
      &lt;/li&gt;               
      &lt;li class="nivell1"&gt;
      &lt;a class="nivell1" herf="#"&gt; Configuració &lt;/a&gt;          
      &lt;/li&gt;
  
      {% if request.user.is_superuser %}                      
      &lt;li class="nivell1"&gt;
          &lt;a href="zona/crear/"&gt;Crear zona&lt;/a&gt;
      &lt;/li&gt;   
      {% endif %}             
  &lt;/ul&gt;                   
  {% endif %}
  </code></pre>
  
  <p>I only have a user in the database and he is a super user. I can see the "logout" button and the other one, but not the "crear zona" button.</p>