Material Rotation

I imported a texture and model into my game and want to apply a texture. I created a material using the texture and added it to the model (a wall). When I saw the texture on the model I realized the texture is not in the right rotation. The brick texture is going top to bottom instead of left to right. Is there anyway to rotate the material on the model so the bricks look like they were built from the group up instead of sideways :)