<div id="mydiv">
</div>

$("#mydiv").load("/path/to/content.html");

<div id="mydiv">
<p>content from file</p>
</div>

<div id="mydiv">
</div>
<p>content from file<p>

$.get('url.html', function(data){ // Loads content into the 'data' variable.
    $('#mydiv').after(data); // Injects 'data' after the #mydiv element.
  });

$('#div_after').remove();
$('#mydiv').after($('<div>').load('/path/to/content.html #div_after', {
    data: data, //variables to send. Useless in your case
}, function () {
    $(this).children().unwrap();}
));

$(this).children().unwrap();