PHP modification needed for osCmmerce Website

I need PHP codes to prevent non-in-stock items to be displayed on the new product page and special price page of an osCommerce website. I already have the code (very short, only three lines) for the index page to not show non-in-stock items, and you can use it as a reference or alter it to make it work for the other two pages. I will not provide any access to the website, only the files such as [login to view URL], spcecials,php, includes/modules/[login to view URL] and [login to view URL] will be provided, you have to test with your own osCommerce on the local server.