Glad to see you got it sorted!

WEP is quite an old protection method, and now very easily broken. For example on my two year old laptop I could get your works WEP passkey in a couple of minutes using some readily available programs from the internet (like airsnort/aircrack etc) with essentially no knowledge of programming or hacking.

WPA on the other hand is secure enough that only the number of people with the neccessary know-how to break the protection is very, very small. Even more secure would be WPA with MAC address filtering, but over a network they might find it a little cumbersome.

So you don't need a lot of information really, just tell them WPA >>>>>>>>>> WEP and they can look it up themselves if they care about their networks security.