Page /Nis/summer10/schedule.html does not seem to exist, because /Nis/summer10/schedule.html.
This probably happened because the link on the referring page (http://www.best.eu.org/Nis/summer10/schedule.html) is wrong or outdated.
Because the refering page is also administered by BEST, we kindly ask you to notify us about this problem using helpdesk. Please mention that there is a dead link on http://www.best.eu.org/Nis/summer10/schedule.html pointing to /Nis/summer10/schedule.html. Thank you.
In the mean time you can try finding what you are looking for by navigating to this directory index or one level higher.