Having trouble blocking website

First time posting here. I will try and explain the situation as best I can.
I am trying to block Youtube.com for some accounts on our school network as it eats a lot of bandwidth, which being in a remote area we don't have a ton of.
Student network accounts authenticate on an OS X 10.5 server, while teachers have admin accounts on their computers. Both students and staff connect to the internet through a proxy.
I can't find a way to block it at the proxy without blocking it for everyone, and the teachers still want access to the website.
I have used Workgroup Manager to block Youtube for the student accounts but it only effects computers running 10.5. We still have labs and carts that are running 10.4 which the settings I have set do not work for.
I have tried setting the hosts file on the 10.4 machines to block the website but so far that doesn't seem to work. I haven't messed with the hosts file before though, so I might be doing something wrong.
For instance in the hosts file I have:
127.0.0.1 localhost
255.255.255.255 broadcasthost
::1 localhost
127.0.0.1 youtube.com
I then use: lookupd -flushcache to flush the dns and reset safari/empty the cache in Safari but I can still access the website.
Any ideas/tips would be greatly appreciated, thanks!

Hi Vekz, and a warm welcome to the forums!
On Tiger/10.4.x at least, you can't use wildcards in the hosts file.
It must include the full name or IP for every instance, like this from mine...
127.0.0.1 ad.ca.doubleclick.net
127.0.0.1 ad.de.doubleclick.net
127.0.0.1 ad.doubleclick.net
127.0.0.1 ad.es.doubleclick.net
127.0.0.1 ad.fr.doubleclick.net
127.0.0.1 ad.free6.com
127.0.0.1 ad.it.doubleclick.net
For you tube I'd try...
Name www.youtube.com
IP address: 74.125.45.100
sjl-mbox1.sjl.youtube.com
sjl-ins1.sjl.youtube.com

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http://users.tpg.com.au/j_birch/plugins/superfish/
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http://www.meanthemes.com/plugins/meanmenu/
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http://coding.smashingmagazine.com/2011/01/12/guidelines-for-responsive-web-design/
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http://www.adobe.com/devnet/dreamweaver/articles/introducing-media-queries.html
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http://tv.adobe.com/watch/learn-dreamweaver-cs6/using-fluid-grid-layouts/
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