As always, we need a new structure for our template. Make sure all these directories exist within each other: blocks, autonav, templatesanddynamic_loadbuilding this path blocks\autonav\templates\dynamic_load.

Create a new file view.php with the well-known content:

<?php 
$bvt = new BlockViewTemplate($b); 
$bvt->setBlockCustomTemplate(false);

include($bvt->getTemplate());
?>

All the magic happens in our JavaScript file view.js:

$(document).ready(function() {
  $(".nav a").click(function() {
    var pageUrl = $(this).attr("href") + " #content > *";

    $("#content").slideUp("normal",function() {
      $("#content").load(pageUrl,"", function() {
        $("#content").slideDown("normal");			
      });
    });

    return false;
  });
});

After you've created all the files, go back to your page and change the Custom Template of the autonav block where you want to try the dynamic page loading.