Hi I'm working through Tony Northrups self-paced 70-562 exam primer and have hit the MS AJAX library namespace section. When trying to run his labs in Firefox the JS doesn't seem to want to work. I've just downloaded IE8 and they work fine in that browser. I don't mind running exercises in just IE8, but if we are to use this technology in a production environment, do we need to write a different flavour of Javascript, or not use this technology at all ? Or just ask our users, very politely, just to use IE8 ? Thanks Tony Leeds, UK