Nickname Styles

[HTML]

Nicknames Styles plugin by Edson Ordáz
http://mods.mybb.com/view/nickname-styles

Here's the issue:

I promote a user to a "Premium" group. They are then allowrd to change their username color. When their premium membership expires, and they are demoted back to the original "member" group, their username color sticks. Is there a way to make the username color revert back to the original default color specified in the "Member" group settings?

Thanks.