the key is to make sure this code block:
<?php
$eCart1->GetContent();
?>
is just after this one:
<?php
//WA eCart Include
require_once("WA_eCart/eCart1_PHP.php");
?>
like this:
<?php
//WA eCart Include
require_once("WA_eCart/eCart1_PHP.php");
?>
<?php
$eCart1->GetContent();
?>