When adding a product to cart from the product_listing page. It carries over some extra url parameters.

Code:
index.php?main_page=shopping_cart&sort=2a&products_id=504
However, when adding to cart from product_info_display. The parameters seem to get cleared.

Code:
index.php?main_page=shopping_cart
Is it important to have these parameters remain in the url once added to cart?

How could they be removed?

Thanks in advance.

~D

zen1.3.8a