anchor.diff:                              button.btn.dtn-default.dropdown-toggle(type='button' data-toggle='dropdown' aria-expanded='false')= t('button.year') 
                                       span.caret
                               ul.dropdown-menu(role='menu')
  -                                li
  -                                    a(href='#') 2015
  -                                li
  -                                    a(href='#') 2014
  -                                li
  -                                    a(href='#') 2013
  -                                li
  -                                    a(href='#') 2012
  -                                li
  -                                    a(href='#') 2011
  -                                li
  -                                    a(href='#') 2010
  +                                each year in [2015, 2014, 2013, 2012, 2011, 2010]
  +                                    li
  +                                        if year != monthNav.current.year
  +                                            a(href = 'program/' + year + '/' + monthNav.current.month + '/' + categories.join(','))= year
  +                                        else
  +                                            a
  +                                                b= year
                       .hidden-xs.col-sm-6.col-md-2.col-lg-2
                           .btn-group
                               button.btn.dtn-default.dropdown-toggle(type='button' data-toggle='dropdown' aria-expanded='false')= t('button.category')
                                       span.caret
                               ul.dropdown-menu(role='menu')
  -                                li
  -                                    a(href='#')= t('categories.theatre')
  -                                li
  -                                    a(href='#')= t('categories.dance')
  -                                li
  -                                    a(href='#')= t('categories.performance')
  -                                li
  -                                    a(href='#')= t('categories.music')
  -                                li
  -                                    a(href='#')= t('categories.lecture')
  -                                li
  -                                    a(href='#')= t('categories.film')
  -                                li
  -                                    a(href='#')= t('categories.new-circus')
  +                                each cat in all_categories
  +                                    li
  +                                        a(href='program/'+monthNav.current.year+'/'+monthNav.current.month+'/'+cat.id)= op.get(cat, ['properties', lang + '-name', 'value'])
   
                       .col-sm-12.col-md-9.col-lg-9
                           ul.pager
                               li.previous
  -                                a(href = 'program/' + monthNav.prev.year + '/' + monthNav.prev.month)
  +                                a(href = 'program/' + monthNav.prev.year + '/' + monthNav.prev.month + '/' + categories.join(','))
                                       span= '← ' + t('month.' + monthNav.prev.month) + ' ' + monthNav.prev.year
                               li.next
  -                                a(href = 'program/' + monthNav.next.year + '/' + monthNav.next.month)
  +                                a(href = 'program/' + monthNav.next.year + '/' + monthNav.next.month + '/' + categories.join(','))
                                       span= t('month.' + monthNav.next.month) + ' ' + monthNav.next.year + ' →'
  
positive.code:                     .col-sm-12.col-md-9.col-lg-9
                          ul.pager
                              li.previous
                                  a(href = 'program/' + monthNav.prev.year + '/' + monthNav.prev.month)
                                      span= '← ' + t('month.' + monthNav.prev.month) + ' ' + monthNav.prev.year
                              li.next
                                  a(href = 'program/' + monthNav.next.year + '/' + monthNav.next.month)
                                      span= t('month.' + monthNav.next.month) + ' ' + monthNav.next.year + ' →'
  
              .col-md-12
  
negative.code:                             button.btn.dtn-default.dropdown-toggle(type='button' data-toggle='dropdown' aria-expanded='false')= t('button.year') 
                                      span.caret
                              ul.dropdown-menu(role='menu')
                                  each year in [2015, 2014, 2013, 2012, 2011, 2010]
                                      li
                                          if year != monthNav.current.year
                                              a(href = 'program/' + year + '/' + monthNav.current.month + '/' + categories.join(','))= year
                                          else
                                              a
                                                  b= year
                      .hidden-xs.col-sm-6.col-md-2.col-lg-2
                          .btn-group
                              button.btn.dtn-default.dropdown-toggle(type='button' data-toggle='dropdown' aria-expanded='false')= t('button.category')
  