ivaxtobac@hotmail.com on "[Plugin: W3 Total Cache] Don't cache some code"

I try it too

<!--MFUNC mycode -->
<?php
	$country = pais_visitante();  // function to get Country Code
	if ($country=="ES") { $pais="España"; } elseif
              ($country=="MX") { $pais="Mexico"; } elseif
                 ($country=="AR") { $pais="Argentina"; } elseif
                     ($country=="CO") { $pais="Colombia"; }
			else { $pais="Común"; $offset=4; }
?>
<!-- /mfunc mycode -->

But still caching this part. I trying remove <?php but in this case it's echo on web.

I'm desperated. Please give me a solution please