Use php include for certain div of the page

[bluefrogx]

Or you could shorten it to

if (file_exists($_SERVER['DOCUMENT_ROOT']."/ads/et300x250".$CountryCode.".html")) {
include($_SERVER['DOCUMENT_ROOT']."/ads/et300x250".$CountryCode.".html");
} else {
include $_SERVER['DOCUMENT_ROOT']."/ads/300x250else.html"; 
} 

Or even better just wrap it into a function and call it wherever you need to call an ad