una/template/messageBox.html

<div class="bx-msg-box-container bx-def-margin-top bx-def-margin-bottom" id="__id__">
    <div class="bx-msg-box bx-def-padding bx-def-round-corners bx-def-color-bg-hl">
        __msgText__
    </div>
    <bx_if:timer>
        <script language="javascript">
            setTimeout("$('#__id__').bx_anim('hide', 'fade', 'slow', function(){$(this).remove();})", __time__);
        </script>
    </bx_if:timer>
</div>