function swm( zakladka )
{

document.getElementById('Forum').style.display = "none";
document.getElementById('menuForum').style.backgroundImage = "";
document.getElementById('Nauka').style.display = "none";
document.getElementById('menuNauka').style.backgroundImage = "";
document.getElementById('Cwiczenia').style.display = "none";
document.getElementById('menuCwiczenia').style.backgroundImage = "";
document.getElementById('Gramatyka').style.display = "none";
document.getElementById('menuGramatyka').style.backgroundImage = "";
document.getElementById('Lektury').style.display = "none";
document.getElementById('menuLektury').style.backgroundImage = "";
document.getElementById('Egzaminy').style.display = "none";
document.getElementById('menuEgzaminy').style.backgroundImage = "";
document.getElementById('Specjalistyczne').style.display = "none";
document.getElementById('menuSpecjalistyczne').style.backgroundImage = "";
document.getElementById('Rozrywka').style.display = "none";
document.getElementById('menuRozrywka').style.backgroundImage = "";
document.getElementById('Szukaj').style.display = "none";
document.getElementById('menuSzukaj').style.backgroundImage = "";
document.getElementById('Platne').style.display = "none";
document.getElementById('menuPlatne').style.backgroundImage = "";
document.getElementById('Inne').style.display = "none";
document.getElementById('menuInne').style.backgroundImage = "";
document.getElementById('Rozmawiaj').style.display = "none";
document.getElementById('menuRozmawiaj').style.backgroundImage = "";

document.getElementById('menu'+zakladka).style.backgroundImage = "url(/templates/247portal-b-grey/images/menu-main-active.png)";

document.getElementById(zakladka).style.display = "block";
createCookie('nextab',zakladka,1);

} 
function createCookie(name,value,days) {
var date = new Date();
date.setTime(date.getTime()+(days*24*60*60*1000));
var expires = "; expires="+date.toGMTString();
document.cookie = name+"="+value+expires+"; path=/"; }
function readCookie(name) {
var nameEQ = name + "=";
var ca = document.cookie.split(';');
for(var i=0;i < ca.length;i++) {
var c = ca[i];
while (c.charAt(0)==' ') c = c.substring(1,c.length);
if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
}
return null;
}