This looks very similar to a library I've been working on (live demo here for webkit browsers: http://city41.github.io/bookends/demo.html http://city41.github.i

This looks very similar to a library I've been working on (live demo here for webkit browsers: http://city41.github.io/bookends/demo.html http://city41.github.io/bookends/demo.html), and it was inspired by a similar framework that is used at my former employer.