$(function() {

  var defaultSection = '#news';
  var links = $('#navigation > a');
  var sections = $('.section');

  function showCurrentSection() {
    var currentHash = window.location.hash || defaultSection;
    var currentLink = links.filter('[href=' + currentHash + ']');
    var currentSection = sections.filter(currentHash);
    links.removeClass('selected');
    currentLink.addClass('selected');
    sections.hide();
    currentSection.show();
  };

  $(window).hashchange(function(event) {
    event.preventDefault();
    showCurrentSection();
  });

  showCurrentSection();
});