if(!isset($_POST['guess']) && !isset($_SESSION['rand'])) {
$_SESSION['rand'] = rand(1,100);
$_SESSION['counter'] = 0;
?>

<h4 style="text-align:left;">I'm thinking of a number between 1 and 100. What is it?</h4>
<form action="guess.php" method="post">
What's your guess?<br /><input type="text" id="guess" name="guess" /><br />
<input type="submit" value="Submit Guess" />
</form>
<?php
$_SESSION['guess'] = $_POST['guess'];
} else {