I came across the story of these two Nigerian spiritual leaders whilst watching Christian TV. The interview was very interesting, with both men sharing how they overcame their hatred for each other, and how they can be friends and do inter-faith work without compromising their own faiths.
Unfortunately I don't feel I can provide a link to the TV station - especially as there is only a link to the full station, not just the interview in question (Mods, let me know if there may be a way of posting a link. I feel this is a very balanced and positive interview indeed. I am happy to give a the link via PM, so you can judge for yourselves ...)

Here are some other links, which tell you a little more:
http://www.africatoday.com/cgi-bin/p...&cat=76&id=878
http://www.fltfilms.org.uk/imam.html

Peace