[BirdOPrey5]

To work only in showthread...

PHP Code:

global $vbulletin;

if (THIS_SCRIPT == 'showthread')
{
  if ($user['field12'] == "GIRL")
  {
     $user['musername'] = '<span style="color:pink;">' . $user['username'] . '</span>'; 
  }
  else
  {
     $user['musername'] = '<span style="color:blue;">' . $user['username'] . '</span>';
  }
} 


If it's not working in whoslonline I'm guessing it needs extra info added to the query, that will be a little bit tougher.