I have an open network in my home because I don't mind casually sharing bandwidth with others who could use it. I've been saved (in a big way) multiple times by someone else's open network and take a pay-it-forward stance. My question is this: I'd like to send a message to people who log on. Is there anyway that I can (easily) do this? I'm thinking something along the lines of the homepages that many city-sponsored wifi networks have.