After using delsurf's mod, I added this code to
/mail/html/order_invoice.tpl
Adds the comment section to the customers email only if there are comments to send...
Code:
{if $order.notes}
<td>
<SPAN>{$lng.lbl_order_notes}:
<textarea name="notes" cols="60" rows="5" {if $usertype eq "c"}readonly{/if}>{$order.notes}</textarea>
</SPAN></td>
{/if}
Hope this shows up correctly on forum, I'm new...
Add this to where you want the comments to show up on the email...
Mine was around line 126...
Hope this helps