Glass Sphere or Less than 1 IOR

Anyone have out there a tutorial on how to build a glass sphere or at least simulate the refractive qualities?

Blender doesn’t seem to allow less than 1 IOR which is what would be needed in order to achieve this effect. Any help would be greatly appreciated.

example:

Well, I found it anyhow :stuck_out_tongue:

http://wiki.blender.org/index.php/Tutorials/Solid_and_Hollow_Glass

It’s done by tweaking the Envmap settings for the object (glass sphere).