function go2url (id) {
if (id == '0') {self.location = 'http://prag-guide.cz/index.php'}
else {self.location = 'http://prag-guide.cz/index.php?id=' + id}
}

function tr_on(id) {
  document.getElementById('tr_'+id).className = 'efekt';
 
}

function tr_off(id,typ) {
  document.getElementById('tr_'+id).className = typ;
}