Closing MacBook Cuts Wireless Internet Connection For Good THXS 10.5.4!

Every time I close my back book (lid?) I lose my internet connection. When I reopen it the Airport Status Icon shows full bars and that I'm connected except that Mail.app says there is no connection and I can't browse the interwebs.
I use a Time Capsule as my Router and it works fine for my PC and iPhone. There are 2 Macbooks in my house and both, after installing 10.5.4 cannot connect to the internet. I use iStumbler which shows me having a strongly signal except no data is going out or coming in
To remedy this I open Network Preferences and go through the diagnostics three time. This sometimes solves it. If it does not I open Airport Utility and fiddle with my setting and hit the button, "Renew DHCP License."
I use a Scientific Atlantic Cable modem and like I said the PC/iPhone all work great. I can't keep spending 20+ Minutes configuring my internet connection EVERY SINGLE TIME I close and reopen my macbook.
Any Ideas? Suggestions or Help? I'll take anything. This voodoo that I'm doing now is not going to cut it.
How am I supposed to lol at my lolcats if I can't get to them! HOW I ASK YOU? HOW?!?!
kkthxbai!

Thank you for replying, Kappy. I did what you suggested and I'm afraid I still have to diddle with the Network Diagnostic to get a network connection. I guess I'll call apple on Monday /sigh.
And yes, I was aware that Airport powers down. I want to be quite clear that when I open the lid I always am able to connect w/in seconds and now I have to constantly try and "refresh" the settings to get back on the net.
Is their a PList File I can delete that may be corrupted?

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