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Fancybox for single photos... I have already found some solutions, but I don't know if it is possible to make rounded corners on "overlay" pictures.
In Lightbox / Fancybox options panel i have entered this parameters and everything is works fine. But nowhere can I find a solution for rounded corners.

showNavArrows:false,
overlayColor:'#000',
padding:0,
overlayOpacity:0.9

I do not think the included version of Fancybox supports rounded corners, because it uses images for the frame.