I have used an iframe which looks like this:
Since you've used the jquery tag this might be handy.
function resizeIframe(height) {
height = parseInt(height);
height += 100;
$('iframe#youriframeID').attr('height', height);
}
In case you are doing cross-browser resizing have a look at this post which explains how to automatically resize the height based on the iframes content. You will need access to the html of the iframed website. Resizing an iframe based on content