oh well then you need your 6 pictures and the shader in the right location
this should look something like this.
the shader
///////////////////////////////////////
textures/your_skybox/the_skybox
{
qer_editorimage textures/your_skybox/picture_for_texture_selection_in_radiant.tga
surfaceparm noimpact
surfaceparm nolightmap
q3map_globaltexture
q3map_lightsubdivide 256
q3map_surfacelight 75
surfaceparm sky
q3map_sun 0.924 0.948 1.000 75 220 60
skyparms env/your_skybox/the_skybox - -
}
/////////////////////////////////////////////////
your files
//////
the pictures in this example are in
/etmain/env/
the pictures you see in radiant is in
/etmain/textures/
the shader of course in
/etmain/scripts/
the pictures need to be named like this
the_skybox_bk.tga
the_skybox_dn.tga
the_skybox_ft.tga
the_skybox_lf.tga
the_skybox_rt.tga
the_skybox_up.tga
/////////
this is the basics. to find the right light settings is another story maybe someone knows better than me an can put some info here.
greetings
cyburk