[PD] GEM: texture on transparent sphere visible from opposite side

[Matthias Kronlachner]

hi!

maybe someone has a suggestion for following problem in GEM:

i have a texture on a sphere and slightly add transparency to the sphere.
i can now see objects behind the sphere, but is it possible to make the 
texture of the opposite side of the sphere visible? (through the 
(semitransparent) front side of the sphere)

thanks
matthias