My Textures are all shadeless?

Hi, semi-new to blender here.
I made a simple first person game and house, but all the texture’s I’m using are appearing shadeless when I press ‘P’.
I’ve triple-checked everything - the shadeless button is definitely not checked. Could someone help me out here? It would be much appereciated :).

Have you set the shading to GLSL ?

Yeah… Nope.
That’s what I needed, thanks a lot!
I feel silly.