You can show off your cats. In a slideshow. Because everybody likes slideshows.
This technique will work without any dynamic scripting at all.
The key lies in the use of the little known :target pseudo-selector.
:target is a core CSS3 selector. So it's supported by pretty much everything.
Sure, there are alternative ways of achieving a similar effect, like this one using checkboxes and sibling selectors. Unfortunately, it only allows you to go in one direction.
Thanks for viewing!