IBook keeps losing TCP/IP settings

Hello there,
My wifes iBook is having a problem with it's airport network. The card is working but it's not recognising the network.
Settings are entered manually but won't work and just keep losing.
Can anyone help with what's happening here? is there a fix.... is there a link I can go to to find out more?
Oh and it's a G3 OSX.3.9
Many thanks.
Kind Regards
Piers

Here are links to some Apple Knowledge Base articles which may help:
http://docs.info.apple.com/article.html?artnum=303595
http://docs.info.apple.com/article.html?artnum=153435
http://docs.info.apple.com/article.html?artnum=107795
http://docs.info.apple.com/article.html?artnum=151804
http://docs.info.apple.com/article.html?artnum=106424

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