IP Detection & Redirect

I need a script written that will do the following - Once a user arrives at my website (i.e. [login to view URL]) the script detects their location and automatically redirects them to a different website site - a users location should be detected using their IP address (I only need IP detection for the following countries - Singapore, Philippines, Malaysia, Indonesia, Thailand, Vietnam) - Based on the users location (one of the 6 countries above) the user is redirected to a specific URL, i.e. a user arrives at [login to view URL] but then is redirected to one of the following sites [login to view URL] [login to view URL] [login to view URL] etc I need you to provide me all the files I need so that I can simply upload them onto my server and redirect all users to the approrpriate website for their country