<!DOCTYPE html>
<html>
<head>
<title>Math Verification</title>
<script>
function checkAnswer() {
var answer = document.getElementById('answer').value;
if (answer == '13') {
window.location.href = 'http://lakehighlander.com/secretlogin/?action=register';
} else {
window.close();
}
}
</script>
</head>
<body>
<h2>Math Verification Page</h2>
<p>Please solve the following math problem: 8 + 5</p>
<input type="text" id="answer">
<button onclick="checkAnswer()">Submit</button>
</body>
</html>