function zmen_cenu(cena) {
      var el1 = document.getElementById('cena_s_dph');
      //var el2 = document.getElementById('cena_bez_dph');
      
      if (el1) {
                  el1.innerHTML = cena;
                  //el2.innerHTML = Math.floor(cena)+",- Kč";
      }
}

function vyber_vlastni(id_radio) {
      var el1 = document.getElementById(id_radio);
      if (el1) {
                  el1.checked='true';
      }
}

function pouzePredni() {
      var ch = document.getElementById('pouze_predni_dily');
      var cont = document.getElementById('pouze_predni_dily_cont');
      if (ch.checked) {
                  cont.style.display='none';
      } else {
            cont.style.display='block';
      }
}
function openWin(theURL,winName,features) {
  window.open(theURL,winName,features);
}