What's the name of that add on that makes ur characters face move on ur hp and mana or energey ect. screen?

X-Perl?

commented here about add on behavior and basically just wanted to know if i should quit trying to figure out how this add on works or if its worth using. its really confusing.

http://photos.tmz.com/galleries/train_wrecks?ncid=aoltop00020000000723