새창으로 서브밋

function submit_auth()
    {
        window.open("","Ucesspay","width=540, height=500, status=yes, help=no, toolbar=no, location=no, menu=no, menubar=no, resizable=no, scrollbars=no");
        document.mainForm.action = "<?php echo $action;?>";
        document.mainForm.target = "<?php echo $target;?>";
        document.mainForm.submit();
    }