I use twitter bootstrap, and trying to do something similar here (a slide out panel).
I have seen the nav-collapse
effect which is quite similar except it drops dow
This looks pretty much like what you need, and it's compatible with Bootstrap 3.0: https://github.com/stevepeak/bump
This is a pretty old question, but for the sake of google searches, I thought it might be good.
I've previously used Javascript based plugin called SnapJS: https://github.com/jakiestfu/Snap.js/
There are some useful implementation demos here: http://jakiestfu.github.io/Snap.js/demo/apps/default.html