Show Block only on Organic Groups (OG) pages - 5.X
Last modified: March 16, 2008 - 19:09
If you want to show a block only on pages that belong to any organic group then use the follwing snippet.
<?php
$group_node = og_set_group_context();
return $group_node->nid;
?>you can customize this further by something like to show only on a certain groups page.
return $group_node->nid==5;
see here
http://drupal.org/node/175505