Paladin to Anti-paladin: class skill change

[elglanto simpatico]

Hello,

I am wondering about what is going to happen to the class skills of a Paladin becoming an Anti-paladin.

For example, take Diplomacy. It is a class skill for the Paladin but not for the Anti-paladin who have Bluff instead. Thus, I was wondering, does the Anti-paladin loses its previous class skill and gain the Anti-paladin ones? Does he have both of them?

I couldn't find the answer in the books but I might have missed it.

Thanks for your help.

[Are]

The skill ranks would remain the same, but the character would lose the +3 bonus to Diplomacy (if he has ranks in the skill), and instead gain a +3 bonus to Bluff (if he has ranks in that skill).