WET11 and WEP

Hopefully someone can help me out with this. I have a WET11 device attached to my iMac, which connects to a netgear wireless router. There are also several PC's attached to the router (wired and wireless).
Up until now, the system ahs been completely open. My roommate wants to secure the connection, so I was looking into using WEP encryption.
This is not an area I know much about and and pretty lost to be hoenst with you. I see where you can generate a key based on a pass phrase you enter. But what after that? Botht he WET11 and router have places to generate the keys, but I don't know what to do with them once they are generated. Is it suppose to be generated on one and then entered on the other?
Are there other ways to secure or password protect a wireless setup such as this.
Thanks all!

yeah, actual security really isn't much of an issue for me though. We noticed a slow down a few days back and thought it might possibly be from someone getting on our connection by accident or something. Personally, I'm not convinced. There's only a house on either side of ours, and pretty much nothing else for 300 feet or more in any direction, so there's just not that many people around who could get on our network, and even when I can pick up other networks from my wet!!, the signal strength is abysmal for the couple of others around. I'm taking a very casual approach to this, not trying to make it fort knox because I frankly just don't care that much. I just want something that would stop the casual person from connecting. Anyone who wants to make any sort of effort can go ahead, it wouldn't do them much good given where we live and how impractical it would be for anyone to spend a bunch of time on our network. I guess I could worry about my immediate neightbors, but I'm pretty trusting like that. its hard to imagine my neighbors as hackers. its actually quite comical because our neighbors probably make 5 times more than I do and in the 50's at least, and wouldn't have a whole lot of reason to break into our network. I mean, we're just some mid 20's people with modest incomes and no real financial info on our computers.
I rather suspect the slow down was because one of our roommates was probably downloading a bunch of less savory material and eating up the bandwith.
Anyway, thanks for the explanation. I saw the hex format number you were talking about, but I didn't know that's what it was called. I'll give this all a go when I get home and maybe I can get it working this time.

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