Ehm..hello,
i have a question. I have made a big map. And I wanted to add a Day Night Sky switching. I mean in 10 minutes the tga sky texture changes from day to night. And after 7 minutes it changed back to Day. I wanted to know how to do that.

Try these:
http://www.gametoast.com/forums/viewtop ... 54#p480654
http://www.gametoast.com/forums/viewtop ... 27&t=18429
http://www.gametoast.com/forums/viewtop ... 27&t=12515

I'm sorry, but those aren't going to work. The conventional sky domes aren't set up to do the dynamic sky you want. The way to do it is to either use This tutorial and make a texture that when scrolled up makes the illusion of the sky changing from day to night and vice versa, or you could place giant objects over your map and have a night sky as the default, then have the objects textured like the daytime, and have their texture scroll to transparency with a dusk texture behind, etc until you get to night.