now for the material of the sphere. we don't need any texture for it, we only go to the 'reflections' and 'refraction' settings, activate them and set them to 'raytrace' without changing any parameters in there. play with the 'reflection' and 'refraction' amount to see what happens. it is a good idea to set the texture editor to display a background, when doing this (the third button on the top right side).
well... thats it, i guess. be creative when using it, see what you can do. happy raytracing.
here is also the file that i have made while creating the tutorial. everything is set up, just add a picture and you can start rendering and playing around. the file is done with max 3.0, so you will not be able to open it with max 1.0/2.0/2.5.