Welcome to the clunky, AJAX-powered way to access the #bcb chat room on irc.rizon.net.
If you’re frequently in the chat, you really should consider moving to a proper IRC application:
On a Mac
Colloquy is the best IRC app for Mac OS X and iOS. You can download Colloquy for Mac here, or get the iOS version on the App Store. Just pick irc.rizon.net as your chat server and set it to join the #bcb room.