Texture on Both Side (Uv texture) (Blender 2.70)

I’m trying to follow the tutorial to make grass in the Blender game Engine :

When I’m trying to apply the texture, it’s displayed only on one face of the plane.
This is probably a very noob question but I don’t find the little button (very well hidden apparently :o ) to make it on both side

Thanks a lot in advance!

My noob blend :
tutorial_grass.blend (544 KB)

Okay, I got it. I was using “GLSL” and not “mulitextured” and apparently with this graphic engine, we need to click on “shadeless” to get it working both sides.
Simple, but it had to be found!