we have an anytime anywhere/ network newly setup in school where the user has to access the internet via a cisco login screen which runs from a WLAN controller. Once the logon details have been authenticated ok, you then keep this window open all the time you then use the internet via another window. This works fine on Windows PCs via explorer, safari or firefox, but doesn't seem to work on MACs, even if you open safari again using cmd N. Any ideas?