// JavaScript Document

function zmienZakladke(id) {

for(var i=1;i<10; i++) {
if(document.getElementById("zakladka"+i)) {
  document.getElementById("zakladka"+i).className = "none-box";
  }
}
document.getElementById('zakladka1').className = "none-box2";

  if(id=="zakladka1") {
  document.getElementById(id).className = "selected-box";
  } else {
  document.getElementById(id).className = "selected-box2";
  }
  
document.getElementById("bookmarks-content").innerHTML = document.getElementById(id+"-content").innerHTML;
}