i was chatting to an old lady the other day and she said for girls just a regular potty is fine but for a boy to get a cup with 2 handles and to use it; as boys are harder to teach and they can hold it and see whats happening sounds interesting. after i was told this i mentioned it to a few people and quite a few of them in the old days used this method, andall had their babies trained by 18months.

im not sure how my cousin did it but her 2y/o twins are 100% toilet trained. she says its the cloth nappies that helped.

anyway don't know if this is much help.
good luck.