Thanks for the linkinformation.

This is your problem:

if you're clicking link $_GET['f'] is NULL. The cookie information for f is unsetted (because the value is NULL).
And on the other link the same problem with $_GET['w'] too.

Try this:

if(isset($_GET['w'])) setcookie("acces",$_GET['w'],time()+31536000) or die("Errore da Accessibilità");
if(isset($_GET['f'])) setcookie("font",$_GET['f'],time()+31536000) or die("Errore da Accessibilità");


Both information can be set, without deleting the other information (because it's NULL). Check before if the variable is set, then setting the cookie.

Hope that solves your problem