Ok - I'm off to bed... I can't fous on the screen anymore, but I did find one slight difference between your code and mine (from page observations)

My form:
<form action=http://www.fez-o-rama.com/index.php?main_page=product_auction_info&amp;cPath=69&amp;products_id=140&amp;number_of_uploads=0&amp;action=add_product&amp;mod=auction enctype=multipart/form-data method=post name=cart_quantity>

yours doesn't have that... I'm just grasping at straws here - but the shopping cart does have a check for mod=auction (which comes after the upload) and I have no clue where this upload thingy is set...

Maybe ?!?

Thanks.