Bah. Going for compactness...

echo "Ohg vg'f ernyyl n irel fvzcyr gnfx" | perl -pe 'y/A-Za-z/N-ZA-Mn
+-za-m/'
[download]

--
Ryan Koppenhaver, Aspiring Perl Hacker
"I ask for so little. Just fear me, love me, do as I say and I will be your slave."