Unable to send variables to MySQL table

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Hi folks... a bit of a newbie question I'm afraid...

I've written this script shown below. It gets its variables from a form, and then it (supposedly!) writes these values into a MySQL table ('invoices').

The script executes with no errors, but when I check the table, the table is still empty. I can manually insert the data directly into the table, and when I echo the variables in the script, the values are displayed whe I run it, but for reasons unknown, the values are not written to the table.

Any ideas? The code is below.

Many thanks.
Stewart

<?php

// this opens the connection to the db
include 'library/opendb.php';

// this adds detals to the invoice table
$item1_desc = $_REQUEST['item1_desc'];
$item2_desc = $_REQUEST['item2_desc'];
$item3_desc = $_REQUEST['item3_desc'];
$item4_desc = $_REQUEST['item4_desc'];
$item1_cost = $_REQUEST['item1_cost'];
$item2_cost = $_REQUEST['item2_cost'];
$item3_cost = $_REQUEST['item3_cost'];
$item4_cost = $_REQUEST['item4_cost'];
$delivery_cost = $_REQUEST['delivery_cost'];

$add_to_db = "insert into invoices (item1_desc, item1_cost, item2_desc, item2_cost, item3_desc, item3_cost, item4_desc, item4_cost, delivery_cost) values ('$item1_desc', '$item1_cost', '$item2_desc', '$item2_cost', '$item3_desc', '$item3_cost', '$item4_desc', '$item4_cost', '$delivery_cost')";
mysql_query($add_to_db);

?>

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