How is a site like Mibbit possible without JavaScript? AJAX is, after all, asynchronous JavaScript and XML, and a site like Mibbit which is constantly updating

How is a site like Mibbit possible without JavaScript? AJAX is, after all, asynchronous JavaScript and XML, and a site like Mibbit which is constantly updating and communicating with servers isn't the same as a site which uses JS for menu rollovers. This seems like a case where the technology necessitates JavaScript usage.