How do you create ad-hoc network at login in Ubuntu?

I have recently started managing a seperate office with only two computers (both running Ubuntu 10.04) that are connected via an ad-hoc network that must be created/connected to each time a person starts up the machines for the day.
The network is set to automatically connect but as it isn’t currently running on either machine at login/startup it doesn’t automatically connect.
If anyone can let me know how to create it at login that would be great.