// Invoke setBodyClass() when a button is clicked.
    $('#switcher').click(function(event) {
      if ($(event.target).is('.button')) {
        if (event.target.id == 'switcher-default') {
          setBodyClass('default');
        }
        if (event.target.id == 'switcher-narrow') {
          setBodyClass('narrow');
        }
        else if (event.target.id == 'switcher-large') {
          setBodyClass('large');
        }
      }
    });