How To Block Sites From Entire Network?

I need to find out how to block websites from a home network. We have one wired computer and 2 that run off wireless internet connected to a Linksys router. We need to keep our kids off of certain sites like MySpace and Dark Age of Camelot (an MMO like World of Warcraft). How can we control which websites the kids... show more I need to find out how to block websites from a home network. We have one wired computer and 2 that run off wireless internet connected to a Linksys router. We need to keep our kids off of certain sites like MySpace and Dark Age of Camelot (an MMO like World of Warcraft). How can we control which websites the kids can and can not access through the network? They still need internet for school so I can not disconnect it completely, and parental controls don't work for sites like MySpace. 10 POINTS FOR BEST ANSWER!
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