How do you detect a website visitor's country (Specifically, US or not)?

Question

I need to show different links for US and non-US visitors to my site. This is for convenience only, so I am not looking for a super-high degree of accuracy, and security or

Answer 1

Depending on which countries you want to distinguish, time zones can be a very easy way to achieve it - and I assume it's quite reliable as most people will have the clocks on their computers set right. (Though of course there are many countries you can't distinguish using this technique).

Here's a really simple example of how to do it:

http://unmissabletokyo.com/country-detector