Does anyone know of a tutorial that will show me how to make a 'popup' like faebook uses (file attached)

I had a quick google but I'm not really sure what to look for. I think its done in AJAX.

Thanks in advance.

Maybe this is something for you: http://malsup.com/jquery/block/#dialog
Or if not, a list of all kind of tools and effects using jQuery where you probably find something you want: http://docs.jquery.com/Plugins