​x
 
<html>
<head>
<script type="text/javascript">
function changeHeight()
  {
  document.getElementById("frame1").height="200";
  }
</script>
</head>
<body>
​
<iframe src="/example/hdom/frame_a.html" id="frame1" height="100"></iframe>
<br /><br />
​
<input type="button" onclick="changeHeight()"
value="Change height" />
​
</body>
</html>
​