showModalDialog一个窗口后，如何可以控制父窗口

parent.jsp:

js 代码

window.showModalDialog('child.jsp',window,'dialogWidth:640px;dialogHeight:520px;status:no;help:no');

child.jsp:

js 代码

<script type="text/javascript">
    var w;
    if (window.dialogArguments != null)
        w = window.dialogArguments;

    function sendRequest(){
        w.location.href="/grant.do?method=advancedQuery";
    }
</script>