hi Louisa -- Thanks for your work at the school, and for this heads up about the videos in Ms Ludlow's blog.  See the email I sent for a  more complete response.  For right now this is more something to deal with at the viewing end than the source end, though it also could eventually be helped by use of a  different video format.    As an after-the-Expo idea, we can help them move away from [assigning you to] manually setting Favorites and Bookmarks at each computer by keeping an easily-updated student resources links page and setting just that one, once only, at the computers.