iFrame resizing dynamically by the height of the content of the destination frame.

iframeHeightResizing.htm

<!-- Include early for reference by the iframe itself -->
<script language="javascript" type="text/javascript">
  function resizeIframe(obj) {
    obj.style.height = obj.contentWindow.document.body.scrollHeight + 'px';
  }
</script>

<!-- the onload triggers the resize against its own content -->
<iframe name="Stack" src="http://my.server.com/path/to/destination.html" frameborder="0" scrolling="no" id="iframe" onload='resizeIframe(this);' />

<!-- src: http://stackoverflow.com/questions/9975810/make-iframe-automatically-adjust-height-according-to-the-contents-without-using/9976309#9976309 -->