[Masiello]

It showing the flashchat inside forum, but in a new window, what to do for not open a new window and open the chat in the same where user clicks on the chat link?

I've replaced that

'redirect' => false, // redirectURL must be a valid URL
'url' => 'http://www.tufat.com/chat.php', // 'redirect' must be set to true for this to work
'window' => '_blank', // the window to open into. possible values: _blank, _self, _parent, or a named window

with that

'redirect' => true,
'url' => '/forums/index.php?', // make sure this points to your forum home page //
'window' => '_parent',

and tried too _self by replacing _parent