a.js

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function addSidebarToggler() {
  if(!$('body').hasClass('sidebar-footer')) {
    $('#content').append('<span class="toggle-sidebar"></span>');
    $('.toggle-sidebar').bind('click', function(e) {
      e.preventDefault();
      $('body').toggleClass('collapse-sidebar');
    });
  }
  var sections = $('aside.sidebar > section');
  if (sections.length > 1) {
    sections.each(function(index, section){
      if ((sections.length >= 3) && index % 3 === 0) {
        $(section).addClass("first");
      }
      var count = ((index +1) % 2) ? "odd" : "even";
      $(section).addClass(count);
    });
  }
  if (sections.length >= 3){ $('aside.sidebar').addClass('thirds'); }
}