osCommerce add product quantity

My osCommerce webshop is based on a template that you can see and try out below: [login to view URL] Unfortunately, the template makers have modified away one feature that I would like: the ability to show product quantities for every product on the product details page. You can see where I would like product quantities inserted on the attached picture "Quantity_is_missing". Of course, it is important that the quantity info fits the overall design on the page. "Quantity: " in suitable size, color and text format would do the trick. This is the job that needs to be done. It looks as if the file [login to view URL] is quite modified in the template. You can find both a standard osC version and a template version of this file attached. The shop is modified with a number of contributions, among these "featured products" and a news script for the front page. I would be happy to supply you with template files and files from the contributions if needed. If you already have an idea about what to do in order to solve the problem, please let me know as you bid for the project. Looking forward to hearing from you.