Printed mugs - where to get them made

My Boss has taken the notion of getting a Colleague a Mug with Text and possibly Photo printed on the INSIDE...Ive searched the Net high and low but havent found a shop yet. Does anyone here know of a place, doesnt matter where, that does do stuff like that? Most Copy Shops just print pictures on the outside...please help!

http://www.kopier-zentrum.com/htm/transfer.htm

Thanks for the link, but they too only print on the outside...

The bastards, sorry.

Do you know that for sure, i.e. have you rung up and asked? I can imagine that printing on the inside is a pretty unusual request, and so might not be listed on their website...