block online radio from browser


I'm having a user of our LAN that constatly hears music from online radios.
He switch to 2-3 pages which makes uses of winamp or wmp interfaces embeed into internet explorer or firefox.

How can I block their ports or block at all?

I'm using a Linksys WRT54G router and I'm adding the url of the pages to be blocked but seems like it don't work at all.

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fabianlujanAuthor Commented:
Hello MYCU,
I couldn't try the solution given.
Perhaps any other solution?
I can get access to the heavy-user machine. Is it a way to block by doing something in the registry, the setup and so on?

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fabianlujanAuthor Commented:
perfect! the techtarget solution did worked for me!
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