There was an error joining to wireless network

Have you ever got this message from you apple? In some occasions with 64bit WEP encryption (128 is ok), there might be problems. You enter the right key, but it will not connect. I got this message several times with my powerbook. Without encryption everything worked fine, but with WEP 64 - error! Even if you delete the key from keychain, nothing wokred.
I searched forums and wikis, googeled a lot. And finally in one page (dont remember anymore where) there was a hint - use dollar sign $ in the beginning of your wep key. Stange, but it works.

Hope you find it when googeling for answer :P