Shopping Cart Woes!!

I am trying to build a shopping cart for my college project. I am able to display items from the database, add items to the cart, but I am unable to view the items that are in the cart. In my "view_cart.php" page I receive the following error: "You have an error in your SQL syntax. Check the manual that corresponds to your MySQL server version for the right syntax to use near 'IN (64) ORDER BY dvd.dvd_title ASC' at line 1". The error appears to be from this part of my script: $query = 'SELECT * FROM dvd IN ('; foreach ($_SESSION['cart'] as $key => $value) { $query .= $key . ','; } $query = substr ($query, 0, -1) . ') ORDER BY dvd.dvd_title ASC'; $result = mysql_query ($query) or die(mysql_error()); Could someone please tell why the query is not working? Thanks in advance.