function switchImage(img) {
    document.getElementById('bigImage').src = img;
    return true;
  }

  function showTable(a, table) {
    table = document.getElementById(table);
    if(!table.style.display || table.style.display == 'none' || table.style.display == '') {
      table.style.display = 'block';
      a.removeChild(a.childNodes[0]);
      a.appendChild(document.createTextNode('skrýt ›'));
    } else {
      table.style.display = 'none';
      a.removeChild(a.childNodes[0]);
      a.appendChild(document.createTextNode('zobrazit ›'));
    }
    return true;
  }