Integrate with RD ADD PHP ?

[Eminos]

Hi,

I just tried to integrate phpfreechat with the rd add php plugin in joomla 1.5.3.
But it seems to crash with Joomla.
I get this error:

Fatal error: Cannot redeclare utf8_substr() (previously declared in /var/www/virtual/bihinternet.com/htdocs/v2/chat/lib/utf8/utf8_substr.php:18) in /var/www/virtual/bihinternet.com/htdocs/v2/libraries/phputf8/mbstring/core.php on line 90

http://www.bihinternet.com/v2/

Is there a workaround kerphi?

Thanks in advance.

/E