loading...............
Código PHP:
<html>
<head>
<title>Titulo</title>
<script>
function resize()
{
if (document.all)
document.getElementById("central").style.height = window.frames.central.document.body.scrollHeight + 20
else
document.getElementById("central").style.height = window.frames.central.document.body.offsetHeight + 20
}
</script>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
<body >
<iframe name="central" id="central" src="inicio.html" frameborder="0" scrolling="no" width=900 height=700 onload="resize()"></iframe>
</body>
</html>
Tu iframe no tenía el id="central"
connection closed.