[Javascript] 부모창에서 팝업으로 submit

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<button class="admin_button button_white" type="button" onClick="fn_payFirst();">결제하기</button>
 
/* 결제팝업창 */
function fn_payFirst() {
    var detailForm = document.detailForm;
    var url = "${pageContext.request.contextPath}/www/pay/payStep1.do";
    var win = window.open("" ,"popForm1", "toolbar=no, width=420px, height=600px, directories=no, status=no, scrollorbars=no, resizable=no");
    win.focus();
 
    detailForm.action  = url;
    detailForm.method  = "post";
    detailForm.target  = "popForm1";
    detailForm.testVal = '${pageContext.request.contextPath}/www/pay/';
    detailForm.submit();
}

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