Hier upload ik de images en product

Mijn code voor het uploaden van de formulier:
<?php
//parse
if (isset($_POST["product_name"])){
$product_name = mysql_real_escape_string($_POST["product_name"]);
$price = mysql_real_escape_string($_POST["price"]);
$category = mysql_real_escape_string($_POST["category"]);
$subcategory = mysql_real_escape_string($_POST["subcategory"]);
$details = mysql_real_escape_string($_POST["details"]);
$details_simple = mysql_real_escape_string($_POST["details_simple"]);
//Check for dupes
$sql = mysql_query("SELECT id FROM products WHERE product_name='$product_name' LIMIT 1");
$productMatch = mysql_num_rows($sql);
if ($productMatch > 0){
echo 'Sorry, this product already exists! <a href="inventory_list.php">Click Here To Return</a>';
exit();
}
//add product to db
$sql = mysql_query("INSERT INTO products (product_name,price,category,subcategory,details,details_simple,date_added)
VALUES('$product_name','$price','$category','$subcategory','$details','$details_simple',now())") or die(mysql_error());
$pid = mysql_insert_id();
$newname = "$pid.png";
move_uploaded_file($_FILES['fileField']['tmp_name'],"../inventory_images/$newname");
header("location: inventory_list.php");
exit();
}
?>Dit is de productpagina met 1 afbeelding

Mijn code op de producten pagina:
<a href="inventory_images/<?php echo $id; ?>.png"><img src="inventory_images/<?php echo $id; ?>.png" width="190" height="150" border="0" /></a>Maar ik wil in totaal 4 afbeeldingen kunnen uploaden en deze op de productpagina kunnen laten zien:
Zo wil ik het hebben: