<meta http-equiv="refresh" content="60" />
<html>
<head>
<script type="text/javascript">
function Reload () {
var f = document.getElementById('iframe1');
f.src = f.src;
}
</script>
</head>
<body>
<iframe id="iframe1" height="200" width="300"
src="http://google.com"></iframe>
<br>
<input type="button" value="Reload" onclick="Reload();">
</body>
</html>