find and display element from the ajax file
<p>Consider this ajax call:</p>

<pre><code>$.ajax({
    type: "POST",
    url: "misc/moreactivities.php",
    data: { lastmsg : ID, pid: pid },  
    cache: false,
    success: function(html){
        $("#profileWall").append(html);
        $("#more"+ID).remove();
    }
});
</code></pre>

<p>Right now it appends everything that is output in <code>moreactivities.php</code>. I only want to append the <code>div#moreactivity</code> element from within it. </p>

<p>How can this be done?</p>
