function show_dl() {
document.getElementById('menu_r_dlonie').style.visibility='visible';}

function hide_dl() {
document.getElementById('menu_r_dlonie').style.visibility='hidden';}

function show_st() {
document.getElementById('menu_r_stopy').style.visibility='visible';}

function hide_st() {
document.getElementById('menu_r_stopy').style.visibility='hidden';}

function show_tw() {
document.getElementById('menu_r_twarz').style.visibility='visible';}

function hide_tw() {
document.getElementById('menu_r_twarz').style.visibility='hidden';}

function show_cialo() {
document.getElementById('menu_r_cialo').style.visibility='visible';}

function hide_cialo() {
document.getElementById('menu_r_cialo').style.visibility='hidden';}