// ----------------------------------------------------------------------------
// select.js
// ----------------------------------------------------------------------------

function submenu(code, items)
{
    this.code  = code;
    this.items = items;
}

// ----------------------------------------------------------------------------

function subitem(name)
{
    this.name = name;
}

// ----------------------------------------------------------------------------

function upd_submenu(menu, submenu, submenu_data)
{
    var i, j = 1;

    submenu.legnth = 0;

    submenu.options[0]       = new Option();
    submenu.options[0].text  = "select Lens Model";
    submenu.options[0].value = '';

    for (i = 0; i < submenu_data.length; i++)
        if (submenu_data[i].code == menu.options[menu.selectedIndex].value)
        {
            for ( ; j <= submenu_data[i].items.length; j++)
            {
                submenu.options[j]       = new Option();
                submenu.options[j].text  = submenu_data[i].items[j-1].name;
                submenu.options[j].value = submenu_data[i].items[j-1].name;
            }

            break;
        }
    
    submenu.length        = j;
    submenu.selectedIndex = 0;
}   

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) {
  error = false;
  form = form_name;
  error_message = "";

check_select("lens_make", "", "You must select lens make from drop down menu.");
check_select("lens_model", "", "You must select lens model from drop down menu.");

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