Can you decipher this code:

Er frg nct. frgp hrxZ

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Request for Question Clarification by rainbow-ga on 01 Nov 2004 13:15 PST

Hi cgl,
Where did you see this?
Rainbow~

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Clarification of Question by cgl-ga on 01 Nov 2004 13:45 PST

friend got it in an e-mail.  asked me for help.  I think it is a
substitution cipher.  If so, FRG & FRGP are either THE & THEM (Y) (N),
or, most likely YOU & YOUR making the second letter O so far, I think
it is DO YOU --- YOUR -O--

I'm lost from here.  Can you help?

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Clarification of Question by cgl-ga on 01 Nov 2004 13:59 PST

Have just found out that person who sent original e-mail is curently
reading the da vinci code.  this might help in deciphering message. 
It might even be in the book! (I haven't read it yet)