Like Shlomi_Nahari said, it isnt possible. But you can try this. Copy your object and paste it at the same spot. Make it bigger and make a new "material" with these settings:
[TWO SIDED]
first:
Ambient: 0.3 BLACK (not [=])
Diffuse: 0.7 BLACK (not [=])
Specula: 0.2 BLACK
Emmissi: 1.0 BLACK
Rough: 32
Trans: 0.0
Brillia: 1.0
BLACK COLOR
second:
Ambient: 0.3 BLACK ([=])
Diffuse: 0.7 BLACK ([=])
Specula: 0.2 WHITE
Emmissi: 0.0 BLACK
Rough: 32
Trans: 1.0
Brillia: 1.0
BLACK COLOR
Quote: "
Amd 2500+ | 1024mb pc2700 | A7N8X-X | Geforce4 ti 4200 128mb"