function postalopen(winName,features) {
        if (document.mousikomi.yuban.value == ""){
        alert("郵便番号を入力して下さい");
        return false;
        }

        var theURL = "/jusyo/yuban.html?";
        theURL += "yuban=" + document.mousikomi.yuban.value;
        window.open(theURL,winName,features);
}