Iran changes dollar for euro or yen in Oil Exports

This is something Ahmadenijad had already announced some months ago, but now it's being formally announced:

"All the oil operations are being made in euros or in yens" Hojjatollah Ghanimifard has explained. Ghanimifard is the director of foreign relations of the Iranian National Oil Company. Iran finishes this way its process of reducing its exposition to the dollar, after the tensions between Teheran and Wasington because of the nuclear crisis. In fact, last december an Iranian Government speaker informed already that 90% of the revenues obtained by the oil exports weren't made in dollars.

Ahmadenijad said this was because the "dollar is no more than a worthless piece of paper", but surely the confrontation due to the Iranian "pacific"
nuclear project has something to do with it.