What to say to someone who believes the holocaust never happened?

I was talking to someone on Omegle recently who at first seemed like generally quite a nice, intelligent guy. Then he told me he is a modern nazi, and that he believes that the holocaust never happened and Hitler was the second coming of Christ.

I was going to end the conversation there and then but I decided I wanted to try and convince him otherwise. I added him on MSN and I told him that I’ll talk to him within a week with enough evidence that he couldn’t possibly believe that any more. Unfortunately my knowledge of the history behind WW2 is quite pathetic so I thought I’d ask if anybody has any decent links/books/resources they think has evidence in that might help.

I know I’m probably wasting my time, and that the chances of him actually admitting he is wrong are almost none existent. However, I think if I can show him enough evidence then maybe he will start to question his beliefs, and who knows in a few years he might change his mind.

Thanks.

Edit: Sorry if this breaks forum rules, I figured since I’m only asking for resources and not trying to provoke a discussion it should be okay?