thanks for providing the URL
that LinkSys site we do see is a 'ready made' thingie for usage of webcams of that specific router which is in use.
if you click on 'show video', it will try on 'Play' to establish an connection to
http://172.21.4.81
.. which is (172. xx) an
internal connection of that LinkSys router device; we can not override from external.. (well, 'you' could probably, .. but that is
hacking .. 😉 )
funny enough, that Windows Vista Users are able to see anything.. I've heard of lots of trouble about 'incompatiblities' between ActivX and Vista.. 😉
probably, you should tell the school admins to use a 'modern' set-up, keywords 'Vista' and 'barrier free' (=usable for handicapped ones...). avoid mentioning MacOs.. 😉
and for sure, for WindowsXP there're zillions of 'webcam apps', which allow an upload of webcams to the internet..
just to mention: ANY Mac has a built in WebServer and the free tool QTbroadcaster is avail. for download at apple.com.. no need for usage of special hardware nor proprietary software components.
maybe, the school should switch to Apple?