Adding thumbnail images to Packing Slips and Invoices, Zencart 1.5.0

Tried using the code I had used to modify zen cart v1.3.8 but after two attempts it just reports back an error message in v1.5.0. Does anyone have the steps to accomplish this in zen cart v1.5.0? I looked around but only found the steps for v1.3.8

can you post the code you tried plz ;)

admin/invoice.php

(line 146)

  <tr  class="dataTableHeadingRow">

replace with

  <tr  class="dataTableHeadingRow">

(line 156)

for ($i = 0, $n = sizeof ($order->products); $i < $n; $i++) {

replace with

for ($i = 0, $n = sizeof ($order->products); $i < $n; $i++) {
  $itemimage = $db->Execute("select products_image from " . TABLE_PRODUCTS . " where products_id = '" . (int)$order->products[$i]['id'] . "'");
  $invoice_image = $itemimage->fields['products_image'];
  if(file_exists ("../images/invoice/" . $invoice_image)) // this part is optional
       {                                                 // this will look for the same filename in
         $invoice_image = "invoice/" . $invoice_image;   // /images/invoice and use that instead
       }                                                 // 

(line 164)

  echo '      <tr class="dataTableRow">' . "\n" .
       '        <td class="dataTableContent" valign="top" align="right">' . $order->products[$i]['qty'] . ' x</td>' . "\n" .
       '        <td class="dataTableContent" valign="top">' . $order->products[$i]['name'];

replace with

 echo  '      <tr class="dataTableRow">' . "\n" . '<td class="dataTableContent"  valign="center">( ) <img width="100" src="/images/' . $invoice_image . '" /></td>' .
       '        <td class="dataTableContent" valign="top" align="right"> ' . $order->products[$i]['qty'] . ' x</td>' . "\n" .
       '        <td class="dataTableContent" valign="top">' . $order->products[$i]['name'];

Any recommendation anyone?