Hmm, this doesn't work in Chrome on your https page, because you load JavaScript (MathJax) with http and Chrome refuses to do that...
//cdnjs.cloudflare.com/ajax/libs/jquery-tools/1.2.7/jquery.tools.min.js
Here's a texpaste showing what you should change your script src's to. https://texpaste.herokuapp.com/n/lyoitffa
On a seperate note, I'm surprised that people actually try it on the https version (or be extra careful and manually add the https).
Fun bit of trivia: these are actually called 'network path references.' http://tools.ietf.org/html/rfc3986.html#section-4.2