function validat_del(lang) {
    var emailStr1 = document.form2.email.value;
    var emailStr2 = document.form2.email_c.value;
    var email_err;
    if (lang == "en") {
        email_err = "Please verify your email";
    } else {
       email_err="Eメールをもう一度ご確認下さい！";
	}
    if (!emailStr1) {
        alert(email_err);
        return false;
    }
    if (!emailStr2) {
        alert(email_err);
        return false;
    }
    if (emailStr1 != emailStr2) {
        alert(email_err);
        return false;
    }
    var emailPat = /^(.+)@(.+)$/;
    var userPat = /^[a-zA-Z0-9\._-]+$/;
    var domainPat = /^[a-zA-Z0-9\.-]+$/;
    var invalid0 = /^(.+)\.(.+)\.(.+)$/;
    var invalid1 = /^\.(.+)/;
    var invalid2 = /(.+)\.$/;
    var invalid3 = /\.\./;
    var eMailArray = emailStr1.match(emailPat);
    if (eMailArray == null) {
        alert(email_err);
        return false;
    }
    var user = eMailArray[1];
    var dom = eMailArray[2];
    if (user.match(userPat) == null ||
        user.match(invalid0) != null ||
        user.length < 3 ||
        user.match(invalid1) != null ||
        user.match(invalid2) != null || user.match(invalid3) != null) {
        alert(email_err);
        return false;
    }
    if (dom.match(domainPat) == null ||
        dom.indexOf(".") == -1 ||
        dom.length < 4 ||
        dom.match(invalid1) != null ||
        dom.match(invalid2) != null || dom.match(invalid3) != null) {
        alert(email_err);
        return false;
    }
    return true;
}