Direct link to a specific photo in a gallery (with lightbox) ?

Hello,

i have a site with 4000+ articles each of them being a av_gallery

Imagine there are 20 photos in a gallery. I would like to be able to link a specific picture from this gallery.
When i see the gallery, if i click on a picture, it appears in a lightbox with the back / forward buttons to browse the gallery. But if i right click and get the link, i only get the direct link to the jpg. And if i put this link on another site, it only links to the picture itself but not to the lightbox.

I hope somebody will understand : is it possible to get a direct link to a specific picture of a gallery showing in the lightbox ?

Thanks