A little research goes a long way... sheesh
http://planetquake.com/qworkshop3/tutorials/train/tut.htm
http://www.claudec.com/lair_of_shaders/tutorials/skyboxes/skyboxes_claudec.shtml
http://www.geocities.com/-harlequin-/quake/
http://www.planethalflife.com/wadfather/
