var ns6=document.getElementById&&!document.all;
var ie4=document.all;
var ns4=document.layers;

function pokaz(identyfikator) { 
if(ie4) 
document.all[identyfikator].style.visibility = "visible";
if(ns6) 
document.getElementById(identyfikator).style.visibility = "visible";
if(ns4)
document.layers[identyfikator].visibility = "show";
}

function ukryj(identyfikator) { 
if(ie4)
document.all[identyfikator].style.visibility = "hidden";
if(ns6)
document.getElementById(identyfikator).style.visibility = "hidden";
if(ns4)
document.layers[identyfikator].visibility = "hide";
}

/* */
   document.getElementById("button_kraj").onclick = function() {
       e5 = document.getElementById("kraj");
       if (e5.style.display == "block") {
           e5.style.display = "none";
       } else {
           e5.style.display = "block";
       }
   }
/* */
   document.getElementById("button_swiat").onclick = function() {
       e2 = document.getElementById("swiat");
       if (e2.style.display == "block") {
           e2.style.display = "none";
       } else {
           e2.style.display = "block";
       }
   }
   /* */
   document.getElementById("button_dzien").onclick = function() {
       e3 = document.getElementById("dzien");
       if (e3.style.display == "block") {
           e3.style.display = "none";
       } else {
           e3.style.display = "block";
       }
   }