Gotpix.com JQuery/AJAX Commenting

<script type="text/javascript">
$('#PP_Post').on('submit', function(e) {
    var $btn = $(this).find('.Submit');

    $btn.attr('disabled', true);
    $btn.val('Posting...');

    e.preventDefault();

    $.ajax({
            type: 'POST',
            data: $('#PP_Post').serialize(),
            url: $(this).attr('action'),
            success: function(msg) {
                var targetOffset = $('#Profile_Posts').offset().top;

                // Insert post
                $(msg).insertBefore('#Profile_Posts .most_recent');

                // Scroll to top of posts
                $("body, html").animate({scrollTop: targetOffset}, 600);

                // Re-enable submit button
                $btn.removeAttr('disabled');

                // Update button text
                $btn.val('POST');

                // Clear old post message
                $('#PP_Post .descriptionField').val('');
            }
    });
});
</script>