Hi Hannah,
This should be fairly easy to do. On your first detail page, you could create a link to your cast list page like this:
<a href="cast.php?<?php echo urlencode($record['title']).$record['num']; ?>" >Cast Detail Page</a>
This is just example code, so you'll have to make a few changes to get it working with your site.
In this example I'm assuming that your detail page records are stored in an array called $record, and that you have a title field.
Then on your cast.php page you would use the normal getRecords function that you would use on a detail page to retrieve all of the records, including the cast list.
Let me know if you have any questions.
Thanks!
Greg
Greg Thomas
PHP Programmer - interactivetools.com