[squid-users] How to block megaupload?

I would like to know how can I block users from downloading from websites
like "megaupload" at a certain period of time. I would like to block users
from downloading from 8 to 12AM and from 2 to 6PM, and only allow them to
download from 12 to 2PM, but the download must be closed after 2PM.

Thanks in advance for the help.

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