<!DOCTYPE html>
<html>
<head>
<script>
function preferedBrowser() {
prefer = document.forms[0].browsers.value;
alert("You prefer browsing internet with " + prefer);
}
</script>
</head>
<body>
<form>
Choose which browser you prefer:
<select id="browsers" onchange="preferedBrowser()">
<option value="Chrome">Chrome</option>
<option value="Internet Explorer">Internet Explorer</option>
<option value="Firefox">Firefox</option>
</select>
</form>
</body>
</html>