function update_transport(id)
{
    //zjisteni url
    var base_path = webDir();

    //vlozeni loaderu
    document.getElementById('transport').innerHTML = '<img src="'+base_path+'images/ajax-loader2.gif" alt="Nahrávám..." class="loader">';

    //zavolani php scriptu
    $("#transport").load(base_path+"doprava_a_platba", { 'akce': 'load_transports', 'payment_id': id } );

    return;
}

function webDir()
{
    base_path = "http://" + window.location.host;
    base_path = base_path + '/';

    return base_path;
}

function delivery_address()
{
    var obj = document.getElementById('fasame');

    if(obj.checked == true)
    {
        document.getElementById('delivery').className = 'invisible';
    }
    else
    {
        document.getElementById('delivery').className = 'visible';
    }

    return false;
}

function change_form()
{
    var obj = document.getElementById('prihlaseni');

    if(obj.checked == true)
    {
        document.getElementById('input_form').className = 'visible';
        document.getElementById('login_form').className = 'invisible';
    }
    else
    {
        document.getElementById('input_form').className = 'invisible';
        document.getElementById('login_form').className = 'visible';
    }

    return false;
}

function checkNumber(e)
{
    if (!e) var e = window.event
    if (e.keyCode) code = e.keyCode;
    else if (e.which) code = e.which;

    if ((code < 48 || code > 57) && code != 8)
    {
      e.returnValue= false;
      e.cancelBubble = true;
      if (e.stopPropagation) e.stopPropagation();
      
      return false;
    }
    else
    {
      return true;
    }
}