Ok, as you can see it works, BUT
It only displays the post number sequentially so if anyone views posts in anything other than the default (ascending by date) or if anyone deletes a post the post numbers won't be the same. I'll give it some thought as to how best to overcome this little problemette
I put the post number where it seems best placed. It can go literally anywhere. Anyone have a better idea, let me know.
Edit: Made a change to the mod
If the topic is sorted by date, either ascending or descending the post number will be correct. If sorted by author or subject all posts will be numbered 0. If a post is deleted the numbering will change. If a post or author is ignored post numbering should be ok.
Bob.