<iframe onload="adjust_iframe_height(this)" src="./?action=common_download_main&upload_id=86" style="width:700px;">
</iframe>
<script>
function adjust_iframe_height(iframe) {
	var scrollbarHeight = iframe.contentWindow.innerHeight - iframe.contentWindow.document.documentElement.clientHeight;
	iframe.height = iframe.contentWindow.document.documentElement.scrollHeight + scrollbarHeight;
}
</script>