// Show the [forum] button.
echo ' <td class="menu-' , $current_action == 'forum' ? 'al' : 'pl' , '"> </td>
<td valign="top" class="menu-' , $current_action == 'forum' ? 'abg' : 'pbg' , '">
<a href="', $scripturl, '?action=forum">Forum</a>
</td>
<td class="menu-' , $current_action == 'forum' ? 'ar' : 'pr' , '"> </td>
<td class="menu-padding"> </td>';