How shoud I set refresh_pattern option in squid?

There are some refresh_patterns in my squid configuration files. Can
anyone tell me what does it mean? What are the first and second numbers?

refresh_pattern -i . 10800 50% 48000
refresh_pattern -i \.gif$ 10800 50% 48000

How can I set refresh_pattern if I want my gif files never expire and
always be in cache . or some files stay in cache longer?

How can I use override-expire , override-reload , ignore-reload option in
refresh_pattern and what does each one of these options do?

    .--.
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   |:_/ | Majid SalimZadeh
  // \ \ Salim@safineh.net
 (| | ) ICQ # 39091933
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Received on Sat Jul 31 1999 - 11:26:00 MDT