Yet another thumbnail ? but with a twist

I posted earlier regarding thumbnails not showing ( figured it out).

Now here’s my new problem.
I want to load my thumbnail in a large grid that scrolls vertically. When you click on a thumbnail the image should load over the thumbnails (blocking them from view) and when
the image is clicked on the image fades out and the thumbnails are back.

I hope i explained this well.

I’ve being searching the threads and have many codes for grids but i can’t get them to work.