CSS Improvements

Fixed a few aesthetic matters.

app/helpers/wiki_helper.rb

@@ -91,6 +91,9 @@ module WikiHelper
         {:class => 'navlink', :id => 'rollback', :rel => 'nofollow'})
   end
 
-  
+  def darken(s)
+     n=s.length/3
+     s.scan( %r(\w{#{n},#{n}}) ).collect {|a| (a.hex * 2/3).to_s(16).rjust(n,'0')}.join
+  end
 
 end