?>
</h1>
<h2>
<?php
$output = "";
if (is_logged_in()) {
$output = "<a href=\"sell.php?id=";
//create a link to sell.php that holds the book id
$output .= urlencode($book_id);
$output .= "\">";
$output .= "Sell This Book";
$output .= "</a><br /><br />";
} else {
$output = cannot_buy_or_sell();
}
echo $output;
?>
</h2>
<br />
<?php
// Build query for finding the name
if (is_logged_in()) {
$query = "SELECT * ";
//prepare a query that displays all the sellers of the book
$query .= "FROM sell ";
$query .= "WHERE book_id = {$book_id}";
$seller_set = mysqli_query($connection, $query);
confirm_query($seller_set);
$output = "<h2>Buy This Book:</h2><h3>";
//find page user is in
?>
<!--<div id="main">
</ul> </div> <!--end categories and navigation-->
<div id="page"><br /> <!--page of textbooks, each occupies a square in space-->
<br />
<!--sorting selection should go here-->
<?php
echo index_header();
//create the buttons of categories and subjects
?>
<h2>
<?php
if (!is_logged_in()) {
echo cannot_buy_or_sell();
}
?>
</h2>
<!-- books-->
<?php
echo index_body();
?>
</div> <!-- div for page content-->
<!--</div>-->
</body>
</html>
<?php
ob_end_flush();