Hola,
Código PHP:
<html>
<head>
<title>Clubdelphi.com</title>
<script type="text/javascript">
var timer = 0;
var reloadTime = 30000;
function ReloadFrame(){
el = document.getElementById('mainframe');
if(el){
el.src = 'http://www.google.es/';
}
return true;
}
function ReloadFrameInterval(){
timer = setInterval('ReloadFrame()', reloadTime);
return true;
}
function ClearReloadFrameInterval(){
if(timer){
clearInterval(timer);
}
return true;
}
</script>
<style type="text/css">
iframe#mainframe { border: none; }
</style>
</head>
<body onload="ReloadFrameInterval();" onunload="ClearReloadFrameInterval();">
<iframe id="mainframe" src="http://www.google.es/" width="100%" height="100%"></iframe>
</body>
</html>