traffic shaping for a specific website?

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http://serverfault.com – I'm not expert in Ubuntu or Iptables , so I have a question related to Traffic shaping. I make the traffic shaping working and everything is under control ( download and upload match the rule that I insert) so my question is : is there anyway to make this traffic shaping working for a specific website ( for example the download from zippyshare is 500 KB/s , the rest websites have the full access ) any help ? (HowTos)