In the file you will see the start of the form:
Code:
<!--bof Form start-->
<?php echo zen_draw_form('cart_quantity', zen_href_link(zen_get_info_page($_GET['products_id']), zen_get_all_get_params(array('action')) . 'action=add_product', $request_type), 'post', 'enctype="multipart/form-data"') . "\n"; ?>
<!--eof Form start-->
then the close of the form:
Code:
<!--bof Form close-->
</form>
<!--bof Form close-->
The Add to cart code has to be between those two some where ...
Your Add to Cart code is above the:
<!--bof Form start-->
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