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<html> <frameset cols="50%,50%"> <frame id="lFrame" src="frame_src.htm"> <frame id="rFrame" src="frame_a.htm"> </frameset> </html>
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<html>
<head>
<script type="text/javascript">
function newSrc()
{
parent.document.getElementById("lFrame").src="http://w3school.com.cn"
parent.document.getElementById("rFrame").src="http://google.com"
}
</script>
</head>
<body>
<form>
<input type="button" onclick="newSrc()"
value="Change frame source" />
</form>
</body>
</html>