Hi, I have found very nice, pro made component of chessboard which enables playing online chess. It can be put on any web, and it comunicates via reverse ajax in realtime cross domain. My question is, how do they do it? As far s I know, reverse ajax is not allowed cross domain.

Check the link: http://www.chessfriends.com/liveGenerator

are there any working libraries for that? I have some php chat server and I want to create something like this chessboard, but for my chat.

Btw, this chessboard is really nice, I will put it into my blog