change the first to lines:
<?php virtual("/WA_ValidationToolkit/WAVT_Scripts_PHP.php"); ?>
<?php virtual("/WA_ValidationToolkit/WAVT_ValidatedForm_PHP.php"); ?>
to use the require_once function instead of virtual:
<?php require_once("WA_ValidationToolkit/WAVT_Scripts_PHP.php"); ?>
<?php require_once("WA_ValidationToolkit/WAVT_ValidatedForm_PHP.php"); ?>
To prevent Dreamweaver from using the virtual() function for including php files in the future, you should modify your site definition. Change the "Create Links relative to:" option on the local info tab to "Document" instead of using "Site".