function getkey(e)
{
  var code;
  if (!e)
    var e = window.event; // nastaveni pro IE
  if (e.keyCode)
    code = e.keyCode; // IE a Mozilla
  else
    if (e.which)
      code = e.which; // NN4
  return code;
}

function numeric(eX)
{
  test=getkey(eX);
  if (test<48 || test>57)
    return false;
}


var form = "";
var submitted = false;
var error = false;
var error_message = "";

function check_input(field_name, field_size, message) {
  if (form.elements[field_name] && (form.elements[field_name].type != "hidden")) {
    var field_value = form.elements[field_name].value;

    if (field_value == '' || field_value.length < field_size) {
      error_message = error_message + "* " + message + "\n";
      error = true;
    }
  }
}



function check_radio(field_name, message) {
  var isChecked = false;

  if (form.elements[field_name] && (form.elements[field_name].type != "hidden")) {
    var radio = form.elements[field_name];

    for (var i=0; i<radio.length; i++) {
      if (radio[i].checked == true) {
        isChecked = true;
        break;
      }
    }

    if (isChecked == false) {
      error_message = error_message + "* " + message + "\n";
      error = true;
    }
  }
}





function check_select(field_name, field_default, message) {
  if (form.elements[field_name] && (form.elements[field_name].type != "hidden")) {
    var field_value = form.elements[field_name].value;

    if (field_value == field_default) {
      error_message = error_message + "* " + message + "\n";
      error = true;
    }
  }
}





function check_form(form_name) {
  if (submitted == true) {
    alert("Tento formuláo již byl odeslán. Stisknite OK a poekejte, dokud nebude zpracování formuláře dokončeno.");
    return false;
  }

  error = false;
  form = form_name;
  error_message = "Vyskytla se chyba při zpracování vašeho formuláře!\nProsíme, proveďte následující opravy:\n\n";



  check_input("dotaz_mail", 4, "E-mail musí mít min.4 znaky.");
  check_input("dotaz_text", 4, "Text dotazu musí mít min.4 znaky.");

  if (error == true) {
    alert(error_message);
    return false;
  } else {
    submitted = true;
    return true;
  }
}
//-->