[eSekar]

you can do it your self without any mod,

you'll have to add 1 script into your header (example):

PHP Code:

<script type="text/javascript">document.write(ul_country);</script> 


then upload a php file to your forum directory
(sample of the php file):

PHP Code:

<?php
$ul_country_code = $_GET['ul_country_code'];
if($ul_country_code){
    switch ($ul_country_code) {
       //---------------------------------------------------------------
       case 'US':
       case 'CA':
       case 'MX':     $ad1 = "xxxxxx"; //MODIFY
       break;
       //---------------------------------------------------------------
       case 'GB':     $ad2= "xxxxxxx"; //MODIFY
       break;
       //---------------------------------------------------------------
       case 'AU':
       case 'NZ':     $ad3= "xxxxxxx"; //MODIFY
       break;
       //---------------------------------------------------------------
       default :      $ad= "xxxxxxxx"; //MODIFY
       break;
    }
$location = "Location: ".$ad;
header($location);
}

?>

then you'll have to put something like this in your ad HTML:

PHP Code:

<script type="text/javascript">
phppage = "http://YOURWEBSITE.COM/main_ul.php";
if (ul_country_code) { window.location.href = phppage + "?" + "ul_country_code=" + ul_country_code; }
else { window.location.href = phppage + "?" + "ul_country_code=" + "default"; }
</script> 


The above is not a functional method and it will not work with you as posted, it needs to be modified and understood, I just wanted to give you an idea where to start.

here is a Link that might help you more.

Good Luck.