Breaking the Vigenere's cipher

It seems that exporting the French Revolution (by you-know-who) is not as easy as you-know-who may think. This particular cipher was broken on February 7th (2006). Right on time.

The crypted text is on this, 119KB large, png picture:




And the secret message goes:

.detnaw yps A
(Note: use the Middle East way of reading.)

Best regards!