这是index也就是父页面，我想要在父页面弹出子页面top的弹出框，请问如何实现。
<body style=" min-width:1400px;">
<div class="index_top"><iframe src="top.html" width="100%" height="100%" frameborder="0" scrolling="no" name="leftFrame" scrolling="No" noresize="noresize" id="topFrame" title="leftFrame"></iframe></div>
<div class="index_header"><iframe src="header.html" width="100%" height="100%" frameborder="0" scrolling="no" name="leftFrame" scrolling="No" noresize="noresize" id="topFrame" title="leftFrame"></iframe>
</div>
<div class="index_centre"><iframe src="centre.html" width="100%" height="100%" frameborder="0" scrolling="no" name="leftFrame" scrolling="No" noresize="noresize" id="topFrame" title="leftFrame"></iframe></div>
<div class="index_footer"><iframe src="footer.html" width="100%" height="100%" frameborder="0" scrolling="no" name="leftFrame" scrolling="No" noresize="noresize" id="footerFrame" title="leftFrame"></iframe></div>
</body>
