Chat system recommendation

Could someone plz recommend a good php or php/mysql based chat system for the web?

I come here b/c I know there are people here who can recommend me past all of the b.s. out there. There are lots of tutorials out there that suck for this. I’ve spent the past several days looking through them.

I know… If I want it done right and exactly the way I want it, I should learn PHP. I am. But, since I’m just starting out, and I need a chat system up fairly soon, I turn to you for help. Any good recommendations? Tutorials, books, etc…

Thank you!