autotab not working in updatepanel

Thanks dharmendr, it is working for my query after changing script code in to my requirement..

<script type="text/javascript">
    $(document).ready(function () {
        Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);
        Sys.WebForms.PageRequestManager.getInstance().beginAsyncPostBack();
        function EndRequestHandler(sender, args) {
            $(".autotab").keyup(function () {
                if ($(this).attr("maxlength") == $(this).val().length) {
                    var index = $(".autotab").index(this);
                    var item = $($(".autotab")[++index]);
                    if (item.length > 0) {
                        item.focus();
                    }
                }
            });
        }
    });

</script>