VPN / Wi-Fi

I am running a VPN on my MacBook Pro for work. The Cisco VPN client I was to download will not work on Lion so I manually configured it through the network settings. I can connect to the VPN with no issues from anywhere. In order to access the work web site from a network outside of my work's network, I have to add two DNS servers and one Search Domain in Networks / Wi-Fi / Advance / DNS tab. When I disconnect from the VPN, I am unable to access the internet unless I remove the two DNS servers and one Search Domain. Is there is a way to setup a second Wi-Fi or something that could be used only when I need the VPN and avoid having to constantly add and then remove these settings? Any suggestions or ideas would be appreciated.

Thanks.