Problem with halo/billboard

Take a look at this file.Here there is a plane with a image of the charater face set as billboard.But when I run my game, the plane face a wrong direction.How can I fix it? Press P to see what I´m talking about.

http://philosopher.soul.googlepages.com/Test2.1.rar (636kb)

http://philosopher.soul.googlepages.com/problem.jpg/problem-full.jpg