Hey,
like my problem!
I will copy my nice skybox textures in HL2 and I was mapped the skybox naming "skyname" with bk, dn, ft, lt, rt and up. Ok
Sorry the hammer complicer was been stupid..
Look at my picture in url: http://www.gwebspace.de/fsnaker_lol/screenshots/test_skybox0000.jpg
by snakemedia