Hamburger-Menu like «»

On the site «» there is an elegant version of Ham-Menu. It has only 2 bars, but clicking on it it opens a menu site. Is this made with Sparkle?
If yes? Anyone an idea howto?
Would be nice! Thanks in advance.

Make a image with 2 bars, attach a link to open a pop-up window.
Very simple.

With screenshots here:

Thanks to all, I will try it.