Written by Ian Sutherland, if I remember correctly.  The link above leads to a cached page, so I'll just add a link to the page itself, which with luck should stay current a bit longer:  Arms of Mary

Here is another take on chording:  Arms of Mary

Here is some tab based on Leo Kottke's arrangement:  Arms of Mary

These pages, and a great many more (mostly Boyzone sites which don't credit the writer) may easily be found through a search at Google.

Malcolm