In this case it was only in the title: I think I should have put "code TO a variable" instead of "code FOR a variable". I don't think it's interesting to prevent the user from editing the post. If the goal is to preserve what was said initially, just mark the post as "Edited" and allow a link to view the initial message. But, I respect OzGrid.
You have requested to edit your last post. Unfortunately the time allowed for editing has passed. I've looked at your post and it is OK, but I would suggest you add another post to it with more explanation of what you want to do.