How to redirect my visitors depending on where they come from (UK or USA)

Hi,
How do i make it so that when someone goes to: www.nintendoshop.net

If they are from the UK, they get redirected to uk.nintendoshop.net and if they are from anywhere else in the world (such as the usa) they get redirected to nintendoshop.net

Does anyone know how to do this? (The best/easiest way)

Thanks.

 

The best way is probably to simply have the user choose where they come from, save it in a cookie for when they return. Similar to how UPS.com does it... http://www.ups.com/content/global/index.jsx?WT.svl=Footer

Geographic IP tracking can be used by it's not 100% reliable.