Trouble connecting new iMac to exisiting PC/Linksys network

I just bought a new iMac and am having trouble connecting to my existing Linksys wireless network. My PC connects wirelessly fine, and the iMac connects if I use the Ethernet connection. However, it says I have "Incompatible Security" when I try to use the built-in Airport wireless connection.
My network is WEP encrypted. I use one of the encryption keys for my PC. I was using 10 128-bit hex. Is there anything special or unique I need to do for the Mac? For example, for the Mac do I also use the 10 or 26 character key, or just the "Passphrase" (as described by Linksys)? Searching the net, I have found old posts suggesting I need to use quotation marks or $ sign in front of the key, but that advice seems outdated.
BTW - I am having the same problem with my new iTouch.
Your help is appreciated.
null

Thanks for posting back when you found the solution.
Just to close things up as to why this would be a problem:
WEP allows for 4 different keys to be configured. Key 1 is used to encrypt the data sent out from the device (either client or access point). When data is received, either of Keys 1-4 can match what is received.
Since OS X only uses Key 1, if Key 1 on your access point doesn't match, it won't be able to decrypt anything that the access point sends back.
The other keys are very rarely used.

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Click on the link to see more details and screenshots.
Resetting an AirPort Base Station or AirPort Time Capsule FAQ
http://support.apple.com/kb/ht3728
iOS and OS X: Recommended settings for Wi-Fi routers and access points
http://support.apple.com/kb/HT4199
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