Scene.Render was added to python in version 2.33 make sure that your running that atleast. Also I would upgrade to python 2.3x.
You could also change the line:
Thank you for your reply. I changed the code as you suggested and got the following error:
no module named Render
I think I will wait a couple of weeks for Blender 2.34. I understand that bvh_import.py and bvh_export.py will be added to the File menu of Import and Export scripts. In any case I think I will have to update to Python 2.3X.