Lost Airport Connection after sleep/shutdown

Hi there,
I have spent a goodly part of this weekend trying to solve this problem, the time has now come to seek assistance from someone who might know what they are doing!
I have an Airport Extreme Base Station, it is connected to an ADSL ethernet router and then to the ADSL phone line. My G5 connects directly to the router via ethernet. My G3 iBook has an airport card and, sometimes anyway, connects to the internet via the base station.
The problem I have been having is that whenever the iBook goes to sleep it loses its Airport connection and to get it back again takes forever switching Airport on and off, going into Internet connect, changing around the TCP/IP settings etc. I eventually get the connection back (with the original settings), but it's becoming a real pain. The same thing happens after a restart or shutdown, it doesn't automatically connect to Airport and takes forever to get it to. A lot of the time the Base Station doesn't show up as an available network, then all of a sudden it will after various tweakings.
I have checked the airport card and it is positioned correctly. The fact that it occassionally recognises the Base Station makes me think also that the card is OK. So my question is, how can I keep the darn thing connected? I feel there is something simple I am missing.
Incidently, this began happening after I had set it up to print through the Base Station, that only worked for a short period of time. I have since get rid of all those settings.
Hope I have given enough information.
Cheers
NikkiG

Hi NikkiG,
You may want to look at these first...
Changing the priority of your network connections
Knowledge Base Document #106653 on Using network locations in Mac OS X
Knowledge Base Document #106858, which is The Airport Troubleshooting Guide
Connecting to the Internet using AirPort
Have you the default network (preferred) to the AP Extreme?
Jon
Mac Mini 1.42Ghz, iPod (All), Airport (Graphite & Express), G4 1.33Ghz iBook, G4 iMac 1Ghz, G3 500Mhz, iBook iMac 233Mhz, eMate, Power Mac 5400 LC, PowerBook 540c, Macintosh 128K, Apple //e, Apple //, and some more... Mac OS X (10.4.5) Moto Razr, iLife '06, SmartDisk 160Gb, Apple BT Mouse, Sight..

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