<!DOCTYPE html>
<html lang="en">
<head>
<title>JavaScript Alert Box</title>
<script type="text/javascript">
function displayMessage(message) {
alert("Your entered text: " + message)
}
</script>
</head>
<body>
<form>
Enter Text:
<input type="input" name="message"/>
<input type="button" onclick="displayMessage(form.message.value)" value="Open Alert Message" />
</form>
</body>
</html>
