PHP Chat software recommendations?

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I have searched on the Internet for a great PHP/JS script that enables to  
talk to other people in realtime. There is a huge amount, and I don't have  
time to test all of them. I thought maybe you could have free  

I like the system of LivePerson, but there a fee. Here's basically what  
I'm looking for, but some one told me it doesn't work in Mozilla. It works  
fine here in Opera and Maxthon: /

I want something that looks like MSN Messenger so that customers don't get  
lost. Obviously the person shouldn't have to signup first! If there is a  
desktop client available too, that would be fine. It has to be free too.


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