function zip_search(query)
{
  var target = document.createElement('script');
  target.src = 'http://kuruma-ex.jp/sell/get_address' + query + '&sell_form[zip_code]=' + encodeURIComponent($('sell_form_zip_code').value) + '&callback=callback';
  document.body.appendChild(target);
}
function callback(res) {
  if(res["error"]=="0") {
    $('sell_form_prefecture_id').value = res["pref_id"];
    $('sell_form_address').style.color = "#000";
    $('sell_form_address').value       = res["address"];
  }else{
    alert('住所が取得できませんでした。');
  }
}