anchor.diff: -<% if logged_in? -%>
  +<%# if logged_in? -%>
   <%  
   # this partial renders a tabnav, you can call it in your views with:
   #   <%= tabnav :main % > (just the tabnav) 
  
positive.code:   #   end
    # end 
           
    add_tab do |t|
     t.named 'People'
     t.titled "Who's who in the MethodBox"
     t.links_to :controller => 'people'
    end 
  
    add_tab do |t|
     t.named 'Methods and Scripts'
     t.titled "Advice and scripts for data cleaning and statistical analysis"
     t.links_to :controller => 'scripts'
    end
  
    add_tab do |t|
     t.named 'Data Sources'
  
negative.code:   # end
  end 
  %>
  <%# end -%>