<html>
<frameset rows="*" cols="125,*" frameborder="yes" border="20px" framespacing="5">
<frame name="leftFrame" scrolling="NO" noresize src="http://www.java2java.com">
<frameset rows="200,*" border="15px" framespacing="0">
<frame name="topFrame" noresize scrolling="NO" src="frame2.html">
<frame name="mainFrame" src="frame3.html">
</frameset>
</frameset>
</html>
Contents of frame2.html:
<html>
<script language="JavaScript">
var m = window.parent.frames.length;
alert(m);
</script>
<body bgcolor="white">
<h2>Frame 3</h2>
</body></html>
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