thread title color by usergroup

[Hawk7173]

I picked up a small mod here on the forum that changes a single assigned user's thread title color.........as follows

if ($thread['postuserid'] == 3975) {$thread['threadtitle'] = '<span style="color: #8B0000;">' . $thread['threadtitle'] . '</span>';}

However, I would like to assign a color to a specific usergroup rather than a single user.

What change would I need to make in order to do so?

Thanks in advance! Tony