list child pages stopped working

At final testing before launch, I saw the sub-pages links. Now the site is live, and the links aren’t there! Only the

tags, nothing is generated in between. I’m using the code to list subpages if there are any, and on all subpages. Here is the code:
‘

<?php
if($post->post_parent) { // page is a child
wp_list_pages(‘sort_column=menu_order&title_li= &child_of=’.$post->post_parent);
}
elseif(wp_list_pages(“child_of=”.$post->ID.”&echo=0″)) { // page has children
wp_list_pages(‘sort_column=menu_order&title_li= &child_of=’.$post->ID);
}
?>

‘

The site is http://www.rogiercommunications.com

any help greatly appreciated