How do I access the svg/vml element of a kartograph.js map?

Question

With kartograph.js I can access the container element of my map like this: mymap.container. But how do I get the actual SVG (or VML) element?

$(mymap.container).find("svg,vml") works, but feels stupid.

In the end, I want to be able to manipulate some attributes of the element (namely preserveAspectRatio, width and height).