virtuemart product details popup

i am looking for a simple solution to show a small javascript or lightbox popup for products on a virtuemart product category page. the popup should show an enlarged version of the product image and also some text, price, order button etc. it should work and look about like the popup on this page: <[login to view URL]> if possible, i'd like to use some existing free/open source solution and customize that solution to my needs. who can provide a such a solution quickly and at a reasonable price? if you need more information, please let me know. thanks a lot. martin.