gỗ ghép
Code chèn iframe :

<script type="text/javascript">  
//<![CDATA[ document.write('<iframe src="http://www.ivietpr.com/" scrolling="yes" frameborder="1" height="500" width="100%"></iframe>'); //]]>
</script>

http://www.ivietpr.com là Url iframe cần chèn.

Code chống chèn Iframe :

<script language="JavaScript"> if (window != top) top.location.href = location.href; </script>