var models = new Array();
  models.push(new Array('91', '306', '690'));
  models.push(new Array('91', '406', '695'));
  models.push(new Array('98', 'Elantra', '778'));
  models.push(new Array('8', 'Equinox', '28'));
  models.push(new Array('112', 'Focus', '894'));
  models.push(new Array('116', 'Lancer', '958'));
  models.push(new Array('89', 'Matiz', '671'));
  models.push(new Array('68', 'Monza', '366'));
  models.push(new Array('43', 'Musso', '158'));
  models.push(new Array('7', 'Rav4', '19'));
  models.push(new Array('77', 'Rio', '531'));
  models.push(new Array('87', 'Siena', '655'));
  models.push(new Array('98', 'Sonata', '786'));
  models.push(new Array('115', 'Sunny', '949'));
  models.push(new Array('67', 'Tercel', '335'));

function makeSelected() {
  make = $('make').getValue();
  options = $('model').options;
  options.length = 0;
  options[options.length] = new Option('Todos', '', true);
  models.each(function(model) {
    if (model[0] == make) {
      options[options.length] = new Option(model[1], model[2]);
    }
  });
}

document.observe('dom:loaded', function() {
  makeSelected();
  $('make').observe('change', makeSelected);
});