Counter Strike - Source Editing

[Mookers]

Hey all I hope someone here can help me out. I have mapped for counter strike on the old Half life game engine with World-Craft then Hammer in the past with no problems. I am however having a small issue with editing CS with this new HL2 engine. I have been all over the net reading and looking for the right answer, but I just can't seem to find one that works for me. My problem is making a skybox that will work. Right now when I complile my map and look up at the sky it looks like your stoned on acid or something, lol. With the old half-life engine I would just make a box around my map and select the skybox texture and apply it. Then I would go and tell it what sky I wanted to have displayed in the map properties. This new updated Hammer dosent seem to work the same way. I know there is the option of a 3D Skybox that allows you to add the illusion of a bigger map by use of buildings in the distance and stuff like that, all i want to know is how to get the basic sky to show up, after that I'll work on the 3D stuff,lol.
If anyone knows good links on the web or has the knowledge how to do this, please post here.

Thanks