1) the doctype tag is at line 1, it should be just before the head tag on the page.
2) change line 2-5:
<?php
//WA eCart Include
require_once("WA_eCart/madelena_cart_PHP.php");
?>
to:
<?php
//WA eCart Include
require_once("WA_eCart/madelena_cart_PHP.php");
?>
<?php
$madelena_cart->GetContent();
?>