Fewer thumbnails than photos in gallery needed.

Hi,
awesome gallery an lightbox. Unfortunately I only want to show the first 3 photos of the gallery on the page. I want the lightbox to open the rest of the photos, when one of the 3 thumbnails is clicked.

I am using the justified option and the gallery is working fine, but I cant hide the rest of the photos, as the div class pgcsimplygalleryblock-justified-item is display block in html ??

Is there a work around or am I missing something in the settings?

Thanks in advance.