rootParent is always the top level section the page is in,
// or to word differently: the first parent page that isn't the homepage.
if($page->path != '/' && $page->rootParent->numChildren > 0) {
// We have determined that we're not on the homepage
// and that this section has child pages, so make navigation:
echo "
- ";
foreach($page->rootParent->children as $child) {
$class = $page === $child ? " class='on'" : '';
echo "
sidebar) echo $page->sidebar;
else echo $homepage->sidebar;
?>