Help! Proxy software or what do i need?

[ScYcS]

Here's the problem:

I am supposed to come up with something (hardware, software, whatever) that does the following:

On a public wireless network, on first opening up a browser, i need a disclaimer page or welcome screen that will be clicked away by an "ok" button of some sort and then it lets the user browse the web.

My first guess is a proxy server with the proxy server software running on a windows 2003 machine (has to be; it's a given). The wireless router would have the gateway set to the win 2003 machine, which uses the proxy.

BUT, which proxy software would let me put a custom html banner in?

Does anyone know? There are things like this in airports and stuff, i just don't know what they're using.....

 

[Nn'theraq'pss]

Create a captive portal in ISA.

 

[MorfiusX]

Well, if you must use Windows 2003: http://www.patronsoft.com/firstspot/

You can achieve the same thing with Linux for free using Captive Portal.

 

[ScYcS]

Can i not just use a Linksys router with dd-wrt firmware and install a radius server on the win2003 machine?!