Ошибка при подстановке данных в запрос

function update_item()
{
$title = mysql_escape_string( $_POST['title'] );
$description = mysql_escape_string( $_POST['description'] );
$query = "UPDATE items SET LectionTitle='".$title."', IncludedFileID='".$description."'
WHERE id=".$_GET['id'];
mysql_query ( $query );
echo $query;
die();
}

function get_edit_item_form()
{
echo '<h2>Редактировать</h2>';
$query = 'SELECT * FROM lection WHERE id='.$_GET['id'];
$res = mysql_query( $query );
$item = mysql_fetch_array( $res );
echo '<form name="editform" action="'.$_SERVER['PHP_SELF'].'?action=update&id='.$_GET['id'].'" method="POST">';
echo '<table>';
echo '<tr>';
echo '<td>Наименование</td>';
echo '<td><input type="text" name="title" value="'.$item['LectionTitle'].'"></td>';
echo '</tr>';
echo '<tr>';
echo '<td>Описание</td>';
echo '<td><textarea name="description">'.$item['IncludedFileID'].'</textarea></td>';
echo '</tr>';
echo '<tr>';
echo '<td><input type="submit" value="Сохранить"></td>';
echo '<td><button type="button" onClick="history.back();">Отменить</button></td>';
echo '</tr>';
echo '</table>';
echo '</form>';
}

LectionTitle  = 'e', IncludedFileID='1'

mysql_query ( $query ) or die (mysql_error());

$query = "UPDATE lection SET LectionTitle='2', IncludedFileID='".$description."'
WHERE id=".$_GET['id'];

function add_item()
{
$LectionTitle = mysql_escape_string( $_POST['LectionTitle'] );
$IncludedFileID = mysql_escape_string( $_POST['IncludedFileID'] );
$query = "INSERT INTO lection (LectionTitle, IncludedFileID) VALUES ('".$LectionTitle."', '".$IncludedFileID."');";
mysql_query ( $query );
    echo '<meta http-equiv="Refresh" content="2;url=./lection.php"/>'; 
die();
}

$description = (int) $_POST['description'] ;

$title = mysql_escape_string( $_POST['title'] );
$description = mysql_escape_string( $_POST['description'] );
$FID = (int)$description;
$query = "UPDATE lection SET LectionTitle='$title', IncludedFileID='$FID'
WHERE id=".$_GET['id'];

echo $query;

var_dump($_POST);

$query = "UPDATE lection SET LectionTitle='Лол', IncludedFileID='".$FID."'
WHERE id=".$_GET['id'];

$FID=(int)$description;

echo $FID;