First things first...
The first two includes need to be all the way at the top, preferably - above the doctype declaration like this:
<?php include "Connections/localhost.php"; ?>
<?php include "WA_CMS/WA_CMS.php"; ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
Ensure that there is no "white space" after your line endings on those either.
After you set that straight, let's go from there and see what we need to get fixed next.