Need some help *URGENT*

Hello so i have been trying to get this working for some time. So would greatly appreciate any help given.
I have to add contents to a shopping cart(database table) for a website and currently having diffficulty getting the information from the product listing page to the cart/database table. I have been trying to get the information via the 'add to cart' button like this:

echo "<form action='addtocart.php?description={$dvd_name}' method='get'>";
echo "Quantity: <input type='number' size='10' name='quantity'></input>";
echo "<br />";
echo "<input type='submit' value='Add To Cart'></input>";
echo "</form>";



Here is my PHP to add the data from the item listing page to the cart.
<?php
$host = "1**.*.0.1";
$user = "102***22";
$password = "v***ie";
$database = "1****122";

$getdescription = $_GET ['description'];
echo $getdescription;
//connect to MySQL
$connect = mysql_connect($host, $user, $password )
or die("Hey loser, check your server connection.");

//make sure we're using the right database
mysql_select_db($database);

$query3 = 'SELECT dvd_name, genre, dvdpic_1, price, delivery, availability, release_date, quantity, description, certificate
FROM dvd_table
WHERE dvd_name="'.$getdescription.'";';
echo $dvd_name;
echo $query3;

$getchosenitem = mysql_query($query3)
or die (mysql_error());

$displaychosenitem = mysql_fetch_array($getchosenitem);
extract($displaychosenitem);

echo $getdescription;

?>

And this is what i am getting:
Notice: Undefined index: description in HOMEDIRS:/htdocs/*******_Web/E-Business/addtocart.php on line 7

Notice: Undefined variable: dvd_name in HOMEDIRS:/htdocs/******_Web/E-Business/addtocart.php on line 19
SELECT dvd_name, genre, dvdpic_1, price, delivery, availability, release_date, quantity, description, certificate FROM dvd_table WHERE dvd_name="";
Warning: extract() [function.extract]: First argument should be an array in HOMEDIRS:/htdocs/1******_Web/E-Business/addtocart.php on line 26

Am i going about this the wrong way?