How to capture stderr while using backtick?

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Ruby Gurus,

I am using backticks in my ruby script to run DOS
commands, but cannot figure out how to separate the
stdin from stderr. 

Please see transcript below for what I am trying to
do:

-------------- begin transcript -------------
 C:\>dir z
 Volume in drive C is LOCAL
 Volume Serial Number is AC53-D8CC

 Directory of C:\

 File Not Found

 C:\>ruby -ve 'puts `dir z`'
 ruby 1.7.2 (2002-06-03) [i386-mswin32]
 File Not Found
 Volume in drive C is LOCAL
 Volume Serial Number is AC53-D8CC

 Directory of C:\
----------- end transcript -----------------

Notice how, when I use Ruby, the stderr message "File
Not Found"  shows up first and then stdin msgs. 

How do I separate the two streams?

TIA,
-- Shanko

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