Woot! worked. that website is so f**** not user friendly but through this URL it worked:
http://extra.csair.com/B2C40/modules/services/transithotel/hotellogin.jsp?lang=en
http://extra.csair.com/B2C40/modules/services/newtransithotel/login.html?lang=en
that's it forwards too
(if the page goes blank just wait. or refresh. you can add 2nd guest later)
i booked 2 rooms 4 pax. got confirmations automatically.