Uploading Image to Database

Hi, I'm trying to get a script working that will upload an image to a MySQL database ... the script seems to be working, in that its not giving errors - but it does nothing ... it doesn't add the image to the database at all. Can someone take a look at this script and let me know where I've gone wrong? Thanks Here is the script I'm using: <?php if ($submit) {

    MYSQL_CONNECT("localhost","user","pass");
    mysql_select_db("binary_date");

    $data = addslashes(fread(fopen($form_data, "r"), filesize($form_data)));

    $result=MYSQL_QUERY("INSERT INTO binary_date (description,bin_data,filename,filesize,filetype) ".
        "VALUES ('$form_description','$data','$form_data_name','$form_data_size','$form_data_type')");

    $id= mysql_insert_id();
    print "<p>This file has the following Database ID: <b>$id</b>";

    MYSQL_CLOSE();

} else {

    // else show the form to submit new data:

?>

    <form method="post" action="<?php echo $PHP_SELF; ?>" enctype="multipart/form-data">
    File Description:<br>
    <input type="text" name="form_description"  size="40">
    <INPUT TYPE="hidden" name="MAX_FILE_SIZE" value="1000000">
    <br>File to upload/store in database:<br>
    <input type="file" name="form_data"  size="40">
    <p><input type="submit" name="submit" value="submit">
    </form>

<?php } ?>