jQuery(function() {
  jQuery("#carMakes").change( function() {
    if (this.selectedIndex == 0)
    {
      jQuery("#carModels").fadeOut();
      jQuery("#carModels").removeOption(/./);
    }
    else
    {
      jQuery("#carModels").removeOption(/./);
      jQuery("#carModels").addOption( "Select a Model", "Select a Model" );
      for (var i = 0; i < makeModels[this.value].length; i++)
      {
        jQuery("#carModels").addOption( makeModels[this.value][i], makeModels[this.value][i] );
      }
      jQuery("#carModels").get()[0].selectedIndex = 0;
      jQuery("#carModels").fadeIn();
    }
  }
  );
  
  jQuery("#carModels").change( function() {
    if (this.selectedIndex != 0)
    {
      document.location.href = "make-model.html?make=" + jQuery("#carMakes").val() + "&model=" + jQuery("#carModels").val();
    }
  }
  );
}
);