Unfortunately it seems like they have changed something between Maya 5 and 6. I couldn't see the smoothed version of the mesh at all. It gave me this:

// Warning: file: C:/Temp/apachesmooth.ma line 2432: Unrecognized node type 'polySmoothProxy'; preserving node information during this session. //

Anyway, all I can suggest is that you get the latest patch to your Maya, if you haven't done so. Another option is that you try to use the attached file. I did the smooth proxy for you in my Maya 5.

Sorry I couldn't help you better. Maybe someone with Maya 6 can?