Split div into three equal parts: snippet 3

gistfile1.js

$('#main_div').width(800).height(500).split({
    orientation: 'vertical',
    limit: 3,
    position: '67%'
  });
  $('#left_pane').width($('#left_pane').width()).height(500).split({
    orientation: 'vertical',
    limit: 3,
    position: '50%'
  });