I've seen a couple of web ones, and one that ran on .NET. Check out www.guild-hall.net, they have a thread in their strategy forum that details the apps like that that exist.

I know it's not the same as writing it yourself, but if you need it working and aren't knowledgeable enough, there's nothing wrong with using someone else's app.

I'd normally give you some detailed help, but it's coming up on end of semester crunch time (all next week), so I'm afraid I don't really have the time until later.