use an iframe with css instead:
Code:
header:
<style type="text/css">
html, body, div, iframe { margin:0; padding:0; height:100%; }
iframe { display:block; width:100%; border:none; border:0; }
</style>
body:
<body>
<div>
<iframe src="/blahhhhhhhhhhhh.php">
</iframe>
</div>
</body>