If this is the correct path to the Digital File Pro HelperPHP.php file:
<?php require_once("WA_DigitalFilePro/HelperPHP.php"); ?>
Then you will need to change the path to the jquery-blockui-formprocessing.js from:
<script type="text/javascript"> src="../WA_DigitalFilePro/jquery-blockui-formprocessing.js" </script>
to:
<script type="text/javascript"> src="WA_DigitalFilePro/jquery-blockui-formprocessing.js" </script>