I am having a couple issues on this portfolio site that I am in the middle of making.

This is the site that I am working on. If you click on the menu on the left, images should pop up horizontally. As you can see, I have tried a couple different methods. I need the photographs to grow/shrink according to the size of the browser window.

I am using this site as a reference. I love how fluid the images shift and I am trying to recreate that effect. I am even fine with media queries, even though the fluid responsiveness is a lot more attractive.

Any help would be very much appreciated!