// Banner v hlavicce
function AF(a){
  document.write(a)
}

function checkMandatory(form_name, mandatory_names_arr) {
  var len = mandatory_names_arr.length;
  var ok = true;
  var elem;
  for(i=0; i<len; i++) {
    elem = document.forms[form_name][mandatory_names_arr[i]];
    if (elem.value == "") {
      ok = false;
      elem.style.borderColor = "red";
      elem.focus();
    }
  }
  
  if (!ok) {
    alert("Vyplňte všechny povinné údaje.");
    return false;
  }
  else return true;
}