expanding list for image custom field

Hi,

I would like to replace virtuemart image custom field button by a expanding list, like this site :

www.pelucashop.com/index.php/virtuemart/...rm-petit-detail.html

Please could you help me ?

thank you
regards,

That was custom work I did for that site, if you want it also send contact email using report to moderator so I could send you offer.