instead of using virtual at line 1 for the connection file:
<?php virtual('/Connections/PowerCMSConnection.php'); ?>
it should use require once,
<?php require_once('Connections/PowerCMSConnection.php'); ?>
i updated the index page for you.
Dreamweaver is using the "virtual" syntax because in your Site Definition, the "Create Links Relative To:" option is set to Site. If you change that to "Document" instead, Dreamweaver will use the "require_once"syntax.