Irrlicht Engine

Ok, so I am editing the example that came with Irrlicht named "SpecialFX". It grabs the shape from the .3DS file and applies the wall.jpg to it.

Now I have changed the shape that is in the .3DS file by lining up the vertexes so that it makes a box (room)...But now I have realize that it is not as easy as I thought. I thought that I could just create a square in 3DS Max 8 and then export it, but I was wrong. It only applies the wall texture to the outside of the box, not inside. Is there any way to get the items that I make in Max8 to look like the one that came with Irrlicht, and apply the texture to the inside?

Sorry if thats confusing, I'm sorta confused myself.
This is what I had to do.

I had to extrude just to get something like this. The red area are the faces that I extruded back.


After I extruded, then I loaded it up with the engine.


Can somebody help? I'm willing to try and explain more.

What I do in my modeling program is Flip All Faces. That way the faces are told to face inwards and render only the inside.
Not sure how you do that in Max.

Thanks a bunch! I was thinking that I have seen a 'Flip Normals Mode' button somewhere, but it didn't work the first time so I had given up.

Thanks again.