Used for a model, the shader seems to show the textures by their alpha channels as well, but I miss something like detail_size.
At the moment the textures are huge and blurry.
Can't find something like detail_size in the manual.

http://www.puppenheim.org/
http://www.wuerfels-welt.de
Old Game Tutorial: http://www.puppenheim.org/MITutorial.zip
Free Game Editor: http://puppenheim.org/AlienalsWeihnachtsmann.zip
http://www.puppenheim.org/blender_starting_main_settings.txt