iframe Height 자동 리사이징

<script type="text/javascript">
function resizeHeight(id)
{
    var the_height = document.getElementById(id).contentWindow.document.body.scrollHeight;
    document.getElementById(id).height = the_height + 30;
}
</script>
<iframe src="#" id="commentFrame"frameborder="0" onLoad="resizeHeight('commentFrame');"></iframe>

출처 - http://eyecandyzero.tistory.com/173