This is just to say that I have invoked my moderator powers to re-open this post
The reason: after clarification by the OP in the comments and after Gerry Myerson edited the question accordingly, the question is no longer a duplicate of the question which it was closed as a duplicate of. (See the post edit history for clarification.)
Edit June 4, 2012: I've now locked the post due to behaviour described by Ilya in the comment which can also be seen by 10K+ users if they visit the post.
Edit Jan 11, 2013: Per Pavel M's answer below, I've unlocked the question.