Below is the code to refresh a div or an element using Jquery.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Refresh</title>
<script type="text/javascript" src="http://code.jquery.com/jquery-1.4.2.min.js"></script>
<script type="text/javascript">
var auto_refresh = setInterval(
function()
{
$('#replace_content').load('replace_content.php');
}, 1000);
</script>
<style type="text/css">
#shouts { background: #36F; height: 200px; overflow: auto; width: 300px; }
</style>
</head>
<body>
<div id="replace_content"><?php include'replace_content.php'; ?></div>
</body>
</html> 