[PHP] Is there a way to customize the 'Username' and 'Password' strings in a 401 auth dialog box?

[Daevid Vincent]

Is there a way to customize the 'Username' and 'Password' strings in a 401
auth dialog box?
 
I want to change mine to say "Webmaster ID" and "Authentication Key".
 
http://php.net/manual/en/features.http-auth.php