php, forms, mysql

Hello, I could use some help. I have two framed pages, upperframe.html and lowerframe.html. In upper frame.html: echo "<table border=1>"; echo "<tr><td></td><td>ID</td><td>Subject</td><td>Open</td><td>Close</td></tr>"; while($row = MySQL_fetch_array($result)) { echo "<tr><td><form><input type=\"checkbox\" method=\"post\" name=\"linia\"></form></td>"; echo "<td><a href=\"????\" target=\"_parent\">{$row['id']}</a></td>"; ?????????????? echo "<td>{$row['subject']}</td>"; echo "<td>{$row['open']}</td>"; echo "<td>{$row['close']}</td></tr>"; } echo "</table>"; I display the content of the main table, which has an autoincrement index. For every index I have another table, something like tableID. What I want is to press on the id from a row in upperframe table and to display in lowerframe the tableID. How can I do that? Thanks a lot, Adrian