sIBL maps for Blender

Support Lighting and Rendering
1

I already found out that there is no direct sIBL support for Blender, but sIBL edit

http://hdrlabs.com/sibl/sibl-edit.html

still generates images that can be used in Blender.

So now I have three different size images, one for a background, one for reflections and one for environmental IBL.

How do I properly set up separate environmental reflection, background, and lighting maps for my scenes in Blender.

Thanks,
Tim