Not sure what your problem is, but I guess it is the texture you use. 
Have you tried the glass materials in textures.inc? For instance try 
this for your cube, after including the textures file:

#include "textures.inc"

material {M_Yellow_Glass}

That should do the trick. Glass has a different ior from air which is 1. 
That is why you need to define a material with a glass ior=1.5.

Have a look at the Docs about the use of materials 
http://www.povray.org/documentation/3.7.0/r3_4.html#r3_4_5_5_3

Also, you should switch to version 3.7 which is the latest and best 
version to date as many issues still present in version 3.6 has been 
corrected, and many new features added.

To better explain your problems, post an image on 
povray.binaries.images. That may help us a lot to determine how to 
improve your scene.

Welcome, by the way, to this community.

Thomas

Thomas

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