$sql12 = mysql_query("SELECT * FROM FSRelate WHERE locate = '$myid' and nick = '$youid' and nick = '$myid' and locate = '$youid' and relate = '1'") or die(mysql_error());
$sql12n = mysql_num_rows($sql12);
if($sql12n==0){ 
if($myid != $youid){
echo "Da inviare";
}
}