Problems with implementing Carmack's Reverse

Hey, I recently added support for Shadow Volumes to my engine. Because I couldn''t stand inside the shadow, I decided to implement Carmack''s Reverse. Well, now I can indeed stand inside the shadow without any problems, but the shadows look very weird, and also, I can see the shadows through the terrain. When I do not use Carmack''s Reverse, the shadows look ok: http://legend.demons.org.il/shadows-good.jpg When I do use Carmack''s Reverse, this is how the shadows look like: http://legend.demons.org.il/shadows-bad.jpg http://legend.demons.org.il/shadows-bad2.jpg This is my rendering function: http://legend.demons.org.il/ShadowFunc.cpp I have no idea what''s wrong. I tried several things to do, but none worked. What am I doing wrong? Thanks, Yuval P.S. Please ignore the textures on the house - the model is using the wrong files