출처 : http://www.sinbd.com/bbs/tb.php/info/715

<script language="JavaScript">
<!--
function calcHeight()
{
//find the height of the internal page
var the_height=
document.getElementById('the_iframe').contentWindow.
document.body.scrollHeight;

//change the height of the iframe
document.getElementById('the_iframe').height=
the_height;
}
//-->
</script>



위 스크립트를 넣어주시고

<iframe width=100% id="the_iframe" onLoad="calcHeight();" src="불러올 내용주소" scrolling="NO" frameborder="0" height="0"></iframe>

이런식으로 불러오면 됩니다.