$()

in js/drill.js [126:135]


    $(".expand-toc-icon").on("click", function(){
      //  This relies on .sidebar's 'left' attribute...may be a cleaner approach
      if($(".sidebar").css('left') == '0px'){
        Drill.Docs._contractSidebar();
        Drill.Docs._contractView();
      } else {
        Drill.Docs._expandSidebar();
        Drill.Docs._expandView();
      }
    })