how to block web messenger services

From: nawalmiftahi@xxxxxxxxx
Date: 20 Mar 2007 11:25:50 -0000

Hi all ,
i am a security admin,yahoo messenger and other chat services are blocked on our network, but we can access them thru web(ebuddy) , i wanted to know how can we make sure that these chat services (yahoo messenger, icq, msn messeger ) cannot be accessed through web as well , i mean how to block them.
thanks

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