<script>
<!--
document.write(
"You are using browser : " + navigator.appName + "<br>"
+ "Code Name :" + navigator.appCodeName + "<br>"
+ "You are using version :" + navigator.appVersion )
// -->
</script>
Note -
JavaScript is all case-sensitive, thus
document.write( navigator.appname + navigator.appcodename +
navigator.appversion ) will yield undefined as output.