newbie NLTK question

[j_pennington_moore]

Anyone using NLTK?  I'm a realtively new, not so hot programmer attempting to use this 
library.  My question is, when I attempt to import the re_show utility like so:

from nltk.util import re_show

I get the following error:

Traceback (most recent call last):
  File "<stdin>", line 1, in ?
ImportError: cannot import name re_show

I believe I installed everything I need to according to the nltk documentation.  Any ideas 
on what to do?

Thanks,
Joe