function loadMerek()
   {
    document.carimobil.merek_id.length = 1;
    for (var i = 0; i < namaMerek.length; i++)
    document.carimobil.merek_id.options[i + 1] = new Option(namaMerek[i], merek2[i]);
    document.carimobil.merek_id.options[0].selected = true;
   }
  function loadModel()
   {
    var currMerek = document.carimobil.merek_id.selectedIndex;
    document.carimobil.model.length = 1;
    if (currMerek > 0)
     {
      var namaModel = model[currMerek - 1].split(',');
      for (var i = 0; i < namaModel.length; i++)
      document.carimobil.model.options[i + 1] = new Option(namaModel[i], namaModel[i]);
     }
    document.carimobil.model.options[0].selected = true;
   }
  function validData() 
   {
    if (document.carimobil.merek_id.options[0].selected)
     {
      alert('Pilih Merk mobil yang diinginkan');
      document.carimobil.merek_id.focus;
     }
    else if (document.carimobil.model.options[0].selected)
     {
      alert('Pilih Model mobil yang diinginkan');
      document.carimobil.model.focus;
     }
    else
     {
   document.carimobil.action="/cgi-bin/index.cgi";
   document.carimobil.submit() 
  }
 }