the thickbox (using jQuery) is not work with phpfreechat , and My chat message cannot show at page

when I enable the chatroom for one of my node types which has thickbox, the thickbox will conflict with prototype.
I met the following $params problem, I try to fix
$params['serverid'] = md5(__FILE__);
unset($params['themepath']);
unset($params['pfc_ajax']);
unset($params['f']);

I can get the chatting interface, but when I send any message, I can see them at message box.
Why?

Can you help me? Thanks in advance.