What code do I place to display the city that visitors come from?

Is there any easy way to do this?

I've never done this before so I've zero experience. Any code recommendations?

Thanks a lot!

 

I thing u have to maintain a database to display with the help ip address.
I have not seen any shortcut for it... Let if any member post link.

 

I found this, exactly what I was looking for.
http://www.maxmind.com/app/javascript_city