Doesn't work on a mobile phone. I can see the chat, I can enter a string into the edit line, but can't submit it (neither in the bottom of the page nor in a separate window). The phone has a touchscreen (no real buttons) so it needs the visual submit button.

Another point is that the chat now causes the phone to reload the forum page quite frequently and this in turn leads to repainting the forum page totally every few seconds. (It repaints the whole page not only the chat sub-window). This makes reading the forum posts quite boring.