Queries close session

I am using the following script to maintain a login session on some pages: <?php session_start(); if(empty($_SESSION['username'])) { die('An error has ocurred. It may be that you have not logged in, or that your session has expired. Please try <a href="index.php">logging in</a> again or contact the <a href="mailto:email@address">system administrator</a>'); } ?> The sessions are stable and work fine EXCEPT when I run another PHP script on the web page such as: <?php // Make a MySQL Connection require "db_connect.inc"; // Retrieve all the data from the "example" table $result = mysql_query("SELECT * FROM members WHERE Status='Inactive'") or die(mysql_error()); echo "<table border='1' cellpadding='0' cellspacing='1' align='center'>"; echo "<tr> <th>Certificate #</th><th>Dan rank</th><th>First Name</th> <th>Last Name</th> </tr>"; // keeps getting the next row until there are no more to get while($row = mysql_fetch_array( $result )) { // Print out the contents of each row into a table echo "<tr><td>"; echo $row['Cert_number']; echo "</td><td>"; echo $row['Dan_rank']; echo "</td><td>"; echo $row['First']; echo "</td><td>"; echo $row['Last']; echo "</td></tr>"; } echo "</table>"; ?> I'm assuming that I am either not maintaining the session properly or not linking the scripts to the session. Any pointers on how to accomplish what I'm trying to do? Thanks, - Ken