You can look at this to see what changes are needed.... This is pruned down so you can read it better.

Things to do are in red.

Code:

---

technique Pixelshader11
        {
                pass p0
                {
                       
                        vertexShaderConstant[64]= { 20.0,20.0,20.0,20.0};
                                                vertexShader=

                        asm
                        {
                                vs.1.1

                                dcl_position  v0
                                dcl_normal    v3
                                dcl_texcoord0 v7 
                   
                                Typical stuff...............



                                // Fog
                                 mov r1.w,c20.w   
                                 dp4 r0,v0,c10 
                                 add r0,r0,-c20.x  
                                 mad r0.x,-r0.x,c20.z,r1.w
                                 max oFog,r0.x,c95.w  
                        };

                    }

  

---