How can I add shades for the sprites?

[Pure-Fat Inc.]

I want to do this (sorry for the bad quality):
http://es.tinypic.com/r/2qd6bsg/8
I've tried searching in the Wiki but I can't find anything.

 

[Sky The Destroyer]

If you're in OpenGL, you need to type "shadow on" in the console.

Software doesn't support that if you're using Software.

 

[Steelie]

Well, our dear sponsor. Run in OpenGL and "shadow 1" in the console.

 

[Pure-Fat Inc.]

Oh, Thank you very much!