[SQU] deny message

Dear friends,
  I have this Acl and access rule in my squid.conf
acl ad url_regex -i ad\.doubleclick\.net
http_access deny ad
  after reconfigure the squid,in the explorer,the ad banner position show "ERROR",I want to change this message to others,how can I do?
  Thanks!

Jingchang Huang
1.13

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