How can i set up free wireless internet in my small restaurant and it be safe?

I want to offer free wireless in my business but want to make sure my own computer is safe and i want a splash screen for anyone that logs on to our internet showing our logo and a disclaimer. How do i do this? I know how to set up a home network, just not sure how to get the security and splash screen.

sounds like your looking for commercial grade Access points, theres many out therem heres 1

http://www.ovislink.com/newovislink/Products/Wireless/WIAS-1000G/WIAS-1000G.asp

this has 2 virtual LANs so admin access is separate from customer access to the internet so your PC is safe and has web based spalsh screen & password authentication.

anyway there are others you just need to look into commercial Access points NOT home broadband routers is all