I was in need of a similar kind of solution, wanted to add data on a wall like facebook, when posted,use prepend() to add the latest post on top, thought might be useful for others..
$("#statusupdate").submit( function () {
$.post(
'ajax.php',
$(this).serialize(),
function(data){
$("#box").prepend($(data).fadeIn('slow'));
$("#status").val('');
}
);
event.preventDefault();
});
the code in ajax.php is
if (isset($_POST))
{
$feed = $_POST['feed'];
echo "<p id=\"result\" style=\"width:200px;height:50px;background-color:lightgray;display:none;\">$feed</p>";
}