jquery for clearing the file upload control

<script type="text/javascript">
    $(function() {
        $('#<%=fluPhoto.ClientID %>').change(
    function() {
        var a = $('#<%=fluPhoto.ClientID %>').val();
        //alert(a);
        var fileExtension = ['jpeg', 'jpg', 'png', 'gif', 'bmp'];
        if ($.inArray($(this).val().split('.').pop().toLowerCase(), fileExtension) == -1) {
            $("input[attr-identity=fluPhoto]").val('');
            MessageBox("Only .jpeg, .jpg, .png, .gif, .bmp formats are allowed.", $('#<%=fluPhoto.ClientID %>'));
 

        }
 

    })
    })
 

 
</script>