<script type="text/javascript">

$(function () {
    var $pleaseWaitDialog= $("#pleaseWaitDialog");

    $(document).on("submit", "#back", function (e) {

        $pleaseWaitDialog.dialog({ modal: true });

        $.fileDownload($(this).prop('action'), {
            httpMethod: 'POST',
            data: $(this).serialize,
            successCallback: function (url) {
                $pleaseWaitDialog.dialog('close');
            },
            failCallback: function (responseHtml, url) {
                $pleaseWaitDialog.dialog('close');
            }
        });
        e.preventDefault; //otherwise normal form submit will occur
    });
});
</script>