[jentulman]

There's a horizontal scrollbar per photoset just below the photo's.

I'm guessing this was designed by someone with a multitouch trackpad. I know I tend to forget not everyone else has 2 finger scroll at their fingertips, I've had to get into a habit of having a test run using a mouse when I put together pages.

[recursive]

I see them now. I missed them because they don't look like scroll bars. I don't even know what 2 finger scroll is. I usually scroll with my mouse wheel. To scroll horizontally, I click the middle mouse button. These scroll bars seem not to support that.

[jentulman]

I only found them after I went looking because of your comment. Seems weird not just to have the single horizontal scroll at the bottom, it's too fiddly.

Those of us using multitouch trackpads can scroll by just swiping on the page using N fingers, like scrolling on a touch phone by dragging the page with your finger.