(Setting up wireless network) How much money should I ask for?

Quick question, my girlfriends boss wants me to set up a wireless network
between 3 computers at the office. Obviously, he's paying for all the
hardware, but I'm the guy that needs to go get the stuff and set everything
up. Won't be a problem, as I've done this for my own computers, but I don't
know how much money to ask for. I'm pretty sure it's a write-off business
expense, but I also want to fair. What's the going rate? Should I ask for an
hourly fee in case things get tricky, or a set fee? What's you guy's
advice?

Thanks,
Mark





MightyMF