<script language="JavaScript" 
type="text/JavaScript">
 if(navigator.appName == "WebTV")
{
 alert("You're using the WebTV browser.")
}
 if(navigator.appName == "Netscape")
{
 alert("You're using a Netscape browser.")
}
 if(navigator.appName == "Microsoft Internet Explorer")
{
 alert("You're using the Internet Explorer browser.")
}
</script>
