Updating Cart From db_cart_example.php

Excellent Class!

I do have a few questions.  Using the example, how can I update the cart from the "order form" or the continue page without having to press the "update" button on the continue page?

I see that if I enter "2" on the order page to order two mirrors, I am taken to the continue page and "2" is in the input field, but if I do not press the "update" button, the cart will only contain one.

Also, the current cart amount is not carried to the continue page.  For example, if I have 3 mirrors in the cart and I chose to add one more from the order page, only "1" appears in the input field on the continue page.

Thanks

I will check this...