Why does chat keep booting me out
 

I've never really used chat before but the other day I thought I'd give it a go.
However whenever I click the chat bit on the pprune home page I get booted off the web.
Currently Iam running windows 98
and Netscape 7. I used to used ie 6 but got fed up with it crashing all the time.
I still have ie 6 and it does the same thing.
My internet provider is ntl broadband.
I have got in to chat in the past when using ie 6.
Oh I'm running pcillin2000
Apart from the change to netscape I've done nothing to the computer since chat used to work.
I've emptied my cache and deleted my cookies.

Thanks in advance