I think you have two options.

1. Consider using Ajax to load your pages
2. Simulate the click event on each page.

For example:

For "Portfolio" items add this

<script type="text/javascript">
  $(document).ready(function(){
      jQuery('#menu-item-38>a').trigger('click');
  });
</script>

For "About Us":

<script type="text/javascript">
  $(document).ready(function(){
      jQuery('#menu-item-180>a').trigger('click');
  });
</script>