OsCommerce multiple Images

I have an Oscommerce web site with some contribution and some hand made change. I would like to have a better product image system. What I need is: - multiple images for each of my items, i want to be like a built in script that changes the preview when you click on the small thumbnail/ or maybe have it pop up lightbox - resizing and image showing must be "smart": if I set a maximum square of 80x80 pixel for the "small" size, if I upload a 800x600 picture, I'll get an 80x60 image, and if I'll upload an 800x500, I'll get a 80x50 image, with no stretching in the pages. If you have already done something similar, a link to the site will be appreciated. If there is not a visible admin section, I'ld like to see at least some screenshot of the product/image insert page. Here you can see an idea of the product page I would like (bigger photo with the small thumbnails): [login to view URL];products_id=86 (here the thumbnail opens a popup rather than swapping the image like a slideshow) If you haven't already done these modify, please let me see what you did with osCommerce. Please let me know how long will it take to do these changes. Thanks