texture alignment in polygones

Hi all,When I make a textured polygone, the upperleft corner of the texture is aligned in the CENTER of the polygone. (I'm using Airport for Windows) Of course I can shift the 4 sections of my texture, but I think there must be a different method: when I look at other scenery bmp-files I notice normal (not shifted) textures.Can anyone help me with this??Thanx heaps!Nick