una/template/block_async_loading_indicator.html

<script>
  $(document).ready(function () {
    var iBlockID = '__id__';
    getHtmlData($('#bx-page-block-' + iBlockID), bx_append_url_params(document.location.href, 'dynamic=tab&pageBlock=' + iBlockID), onAsyncBlockLoad, 'post', false, {includedCss: JSON.stringify(aIncludedCss), includedJs: JSON.stringify(aIncludedJs)});
  });
</script>