When it sleeps I lose connection

Hello, I'm new to the Mac world. I just purchased my first iMac last week and an Airport Extreme. I set it up wirelessly and it connects directly to an old PC and a printer. Every time it goes to sleep or I turn it off my internet does not work. It says that it is still connected to the network that I set up but it will not connect. Eventually I will turn off the airport and turn it back on and it will work. Does anyone know why this is happening? Thank you in advance for your help.

It seems to be a known bug. Check out the discussion here:
http://discussions.apple.com/thread.jspa?threadID=859184&tstart=0
MacBook Pro   Mac OS X (10.4.8)  

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