text: function toggle_menu() {
    var t = document.getElementsByClassName("toggle_icon");
    var nav = document.getElementById("navbar_top");
    
    if (t[0].classList.contains('hidden')) {
       t[0].classList.remove('hidden');
      t[1].classList.add('hidden');
      t[1].classList.add('hidden_small');
      nav.classList.add('hidden_small');
    }
    else {
      t[0].classList.add('hidden');
      t[1].classList.remove('hidden');
      t[1].classList.remove('hidden_small');
      nav.classList.remove('hidden_small');
    }
  }
  function close_price_descr() {
    var d = document.getElementById("price_descr");
    d.classList.add('hidden');
  }
  function open_price_descr() {
    var d = document.getElementById("price_descr");
    d.classList.remove('hidden');
  }