function ZipSearchOpen(){
  var target = 'http://www.rokitechno.com/cgi-bin/BAK_ROKI/rokitechno2/zip_search.cgi?zip_search=' + document.form.郵便番号1.value + document.form.郵便番号2.value;
  var SWA;
  SWA = window.open(target,"zipresult","WIDTH=450,HEIGHT=300,toolbar=no,location=no,status=no,menubar=no,directories=no,scrollbars=yes");
  SWA.focus();
}