Well glad it's working esther. The box you checked for transparency is normally checked when you are using the transparency channel like an alpha channel. This depends on how the texture is setup, but is often used. I think christina may be referring to what I mentioned earlier about setting the shader under refraction to a 1-100% value like you did with reflection and starting low and working your way up.You have to show us your render.enigmaticfrog I think posting the link is fine to a product you like...it is certainly relative.

No need to think outside the box....
    Just make it invisible.