WEP is fairly easy to crack unless your key is dynamic, in which case it could take anywhere from weeks to forerver to break it. WPA would be much more secure if your model supports it. A lot of older netgear routers don't have it but there are firmware upgrades available for some of them on netgear's site.
Here is the doc to configure WPA
http://kbserver.netgear.com/inquira/...75#__highlight