xsi5 : Environment map and fog

Is there any way to have fog effect without the environment map getting affected by the fog? I am trying to get the object to dissolve to the custom bkgnd. I tried volume effects, volume_fog, constant density; and a number of other shaders in the Pass/edit/edit current pass; with no avail. I also tried using the gradient and mixer nodes on the beauty object to dissolve out to alpha, but that's not giving me any good results. Any help would be appreciated

Do you want to have a clear background or clear reflections?