Private chat not private

Hello,

When I click the username there is no new popup window as shown in the screenshot, the chat text area just has @username – messages that are sent this way (@username message to send) are not actually private, everyone (even non logged in users) can see. Please take a quick look: http://funpix4kids.com/thelounge/

Thanks for your support,

http://ww.wp.xz.cn/plugins/quick-chat/