[nasty.web]

just echo the HTML

<?php
$country = wp_ozh_getCountryName(0) ;
switch ($country) {
   case "Canada" :
        echo '<a target="_blank" href="http://www.affiliate.com/fs-bin/click?id=referrer_ID"><IMG alt="Canadian Banner" border="0" src="http://images.affiliate.com/outsidebanners/Homepage-120X600.gif"></a><IMG border="0" width="1" height="1" src="http://ad.affiliate.com/fs-bin/show?id=referrer_ID">';
        break;
   default :
        echo '<a target="_blank" href="http://www.affiliate.com/fs-bin/click?id=referrer_ID"><IMG alt="American Banner" border="0" src="http://images.affiliate.com/outsidebanners/Homepage-120X600.gif"></a><IMG border="0" width="1" height="1" src="http://ad.affiliate.com/fs-bin/show?id=referrer_ID">';
}
?>

HTH