I just integrated your Chat in my forum and everything works finde with one exception.
When the Username contains german umlaute like öäü, they are not correctly displayed at the bottom before the text inputfield. Here an image how it looks:

The website is encoded in ISO-8859-1
In my chat config I have the following lines:
$params['nick'] = iconv("ISO-8859-1", "UTF-8", $user_info['name']);
$params["output_encoding"] = "ISO-8859-1";
I use the latest version in the svn repository.
Can anybody tell me what i am doing wrong?
Thanks,
Harald