Iframe SSI script II

http://www.dynamicdrive.com/dynamicindex17/iframessi2.htm

I'm having problems with Iframe SSI script II. No matter what I try, the frame only stays the size like what looks about 300 x 200. I can't make it so it shows the whole external page. Is there a way to make it so it actually shows the full external page?

I think it has something to do with this part of the code but I can't get it to make it the width and height I want. How do I do that? Thanks.


<body>

<iframe id="myframe" src="externalpage.htm" scrolling="no" marginwidth="0" marginheight="0" frameborder="0" vspace="0" hspace="0" style="overflow:visible; width:100%; display:none"></iframe>

</body>
</html>