When I visited PGC today, an irritating JavaScript alert popped-up saying "This page does not support your browser. A browser version 4.0 or higher is required!". If I click this alert away it comes back within a second, making it impossible for me to read or click on anything on the main site. This does not happen when I visit the forums. I am using Mozilla 1.5 RC1(Windows version) at the moment, which has been working perfectly on the PGC site ever since it was released. Why is this happening?