Show_menu2 is soooo powerfull:

<?php
$parent = show_menu2(0, SM2_ROOT, SM2_ALL, SM2_ALL|SM2_CURRTREE|SM2_BUFFER,
'[if(id==parent || class==menu-expand){ [menu_title] }]','','','');
echo "<h2>".$parent."</h2>";
?>
This will show your parent menu name.
Ruud