<html>
<head>
<script type="text/javascript">
function detectBrowser()
{
var browser=navigator.appName;
var b_version=navigator.appVersion;
var version=parseFloat(b_version);
if ((browser=="Netscape"||browser=="Microsoft Internet Explorer") && (version>=4))
{
alert("Your browser is good enough!")
}
else
{
alert("It's time to upgrade your browser!")
}
}
</script>
</head>
<body onload="detectBrowser()">
</body>
</html>
