x es
codice:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>
<head>
<title>ridimensiona iframe a massima altezza</title>
<script language="JavaScript" type="text/javascript">
<!--
function ridimensionaIframe(){
	var brHeight=(window.innerHeight)?window.innerHeight:
	((document.documentElement && document.documentElement.scrollTop)?
	document.documentElement.clientHeight:document.body.clientHeight);
	document.getElementById('mioIframe').style.height=brHeight+'px';
}
window.onload=ridimensionaIframe;
window.onresize=ridimensionaIframe;
//-->
</script>
</head>
<body>
<iframe id="mioIframe" src="pagina.htm"></iframe>
</body>
</html>
ciao