Unity textures only shown in scene mode, not in game mode??

Hi,

I downloaded a very nice (character)model from blender-models.com,
too bad I have a small problem with it. In scene view everything looks good (screenshot),

alt text

but when I test the game in the game mode, some of the textures seems to dissapear.
How is it possible that everything is ok in the scene view but not in the game-view?

Does somebody knows how I can solve this problem? That would be great! : ) Thanks

Greetings

Do you have any lights in the scene?