you put it in the right place, but i gave you bad redirect code, sorry about that.
the correct code is:
activity_groups_results.php?group_id=<?php echo($_SESSION['group_id']); ?>
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.