If that doesn't work, along with the above modification find the following in index.php
Code:
if ($loggedin['usergroupid'] == 6 and $highlightadmin) {
$username = "<b><i><font color=red>$loggedin[username]</font></i></b>"; // Color for Admin
and add under
Code:
} else if (($loggedin['usergroupid'] == XX) and $highlightadmin) {
if ($loggedin['usergroupid'] == XX and $highlightadmin) {
$username = "<b><i><font color=red>$loggedin[username]</font></i></b>"; // Color for Other Admin
and again replace XX witht he group id
Drk