update_nav.js

updateNavigation : function(sections) {
  DV.Schema.data.chapters = [];
  _.each(sections, function(sec) {
    sec.id = _.uniqueId();
    sec.pages = '' + sec.start_page + '-' + sec.end_page;
    _.each(_.range(sec.start_page-1, sec.end_page), function(i){
      DV.Schema.data.chapters[i] = sec.id;
    });
  });
  DV.controller.models.chapters.chapters = DV.Schema.data.chapters;
  DV.Schema.data.sections = sections;
  $('#DV-navigationBolds', document.head).remove();
  DV.controller.helpers.renderNavigation();
},