Definir ubicacion archivo

Its super easy. Download the maxmind geo lite file and save it in a folder called geo

Then create a file called geo.php (should be saved in the geo folder) and place this in it.

PHP Code:
<?php   
global $country; 
require_once 'geoip.inc'; 
$geo = geoip_open($_SERVER["DOCUMENT_ROOT"].'/geo/GeoIP.dat', GEOIP_STANDARD ); 
$country = geoip_country_code_by_addr($geo, $_SERVER['REMOTE_ADDR']); 
?>
Now add the following to your page

PHP Code:
<?php include ($_SERVER["DOCUMENT_ROOT"].'/geo/geo.php'); global $country; // Add this to the top of your page (or anywhere above where you're going to add some geo targeting ?>
PHP Code:
<?php if($country=='US'): ?>
USA ad goes here

PHP Code:
<?php else: ?>
ROW ad goes here

PHP Code:
<?php endif; ?>
If you have any problems I'll be on Skype for a few hours - I don't mind setting up the first page for you...so you have a working example.

Edit - if you are using more than one country or putting the ad on multiple pages I would set up an include for the ads and do something like this (just makes updating that much easier)

PHP Code:
<?php include ($_SERVER["DOCUMENT_ROOT"].'/geo/geo.php'); global $country; // Add this to the top of your page (or anywhere above where you're going to add some geo targeting ?> 

<?php if ($country=='US') { 
include ($_SERVER["DOCUMENT_ROOT"].'/ad/usa.php'); 
} elseif ($country=='CA') { 
 include ($_SERVER["DOCUMENT_ROOT"].'/ad/canada.php');  
} 

 else { 
include ($_SERVER["DOCUMENT_ROOT"].'/ad/euro.php'); 
 } 
?>