var contentFontSize;
window.addEvent('domready', function() {
  contentFontSize = new Font($('contentCell'), [11, 14, 17]);
  if ($('decreaseFontSize')) {
    $('decreaseFontSize').addEvent('click', function() {
      contentFontSize.decrease();
    });
  }
  if ($('increaseFontSize')) {
    $('increaseFontSize').addEvent('click', function() {
      contentFontSize.increase();
    });
  }
});