Oscommerce Mods

Hello.. Ok, we have an oscommerce site When the index page displays the products with the product_listing module we have a sort order filter set up so a user can click to look at the products by name a-z and price high to low.. Now what we want is to add to this the date added (date added newest/dare added oldest) filter.. And secondly, we need the above filters added to the new_products module. so basically using the same code that works the filters on the above module.. If you know about oscommerce and how the queries work it will be a breeze as the code is already there for it on one module. If you want the url then drop me a message.. Thanks