javascript - Dynamically load new content using Jquery -

i have php file , when page load data page include after page load have jquery code load new content php code every 50 seconds. here first php page code

<div id="load" class="scroll-cont"> <?php include 'time_line.php'; ?>  </div> 

ok jquery code

var autoload = setinterval( function () {   $('#load_post').load('last.php').fadein("slow"); }, 40000); 

this jquery code data last.php , loaded on <div id="load" class="scroll-cont"> erase data <?php include 'time_line.php'; ?> loaded before. after every 50 seconds again erase data jquery loaded before. how can possible keep old loaded data , add new content div?? can see example on twitter timeline when new data loaded added on old ones

it seems load not support this. can achieve same using $.get:

var autoload = setinterval( function () {   $.get('last.php', {}, function (res) {     $('#load_post').append(res).fadein("slow");   }) }, 40000);