Do I win a prize for finding it? Anything? No, nothing at all! Awww...
KaratinaBar is what you're looking for. Found it by searching "mana bar" in the title and description and looking through anything that sounded like it could be related. It even has posts from you! You could have just looked at your past posts! GRrrr! Don't know if it works for WoTLK though hasn't been updated for a long time.
Hope that helps.
Vpr