It wasn't an article. It was a post on the Running Total article and Tom updated it with a slightly different take on the check. Tom's post with both his an Paul White's code puts it altogether quite nicely at the following post, the URL for which is also posted at the beginning of the Running Total article. Heres' the link for Paul and Tom's contribution.
http://www.sqlservercentral.com/Forums/FindPost981258.aspx
--Jeff Moden
Change is inevitable... Change for the better is not.