[support] CCK Contemplate 'Add to cart' button - remove quantity box

Sorry to post this again, but I have a really urgent rather tiny design question: Using Drupal 5.x, CCK and Contemplate (and Ecommerce) I have added print drupal_get_form('product_cart_form', $node); to my teaser template, and it displays the quantity box and the add to cart button. My question: Is there a possibility to ONLY display the 'Add to cart' button WITHOUT the quantity box (with the quantity automatically set to '1')? What do I have to write into my teaser template in order to achieve this? Thank you Laura.