you have the :
<?php require_once("WA_CMS/WA_CMS.php"); ?>
line outside of the document head:
<html xmlns="http://www.w3.org/1999/xhtml">
<?php require_once("WA_CMS/WA_CMS.php"); ?>
<!-- InstanceBegin template="/Templates/Themes/TownOfBlackBrook2013Jo_fw_theme.dwt.php" codeOutsideHTMLIsLocked="false" -->
<head>
<!-- InstanceBeginEditable name="EditRegionHead" -->
it should be after the opening <head> tag and before the closing </head> tag:
<html xmlns="http://www.w3.org/1999/xhtml">
<!-- InstanceBegin template="/Templates/Themes/TownOfBlackBrook2013Jo_fw_theme.dwt.php" codeOutsideHTMLIsLocked="false" -->
<head>
<!-- InstanceBeginEditable name="EditRegionHead" -->
<?php require_once("WA_CMS/WA_CMS.php"); ?>