How to create two independent DoubleTree in same div?

I need to create a tree structure with two trees from one root. DoubleTree was ideal for this purpose. But now there is a need for two such trees within one div, as in the picture below. Is it possible to do so in (in other words, create two roots within one div) ?

Put the root nodes in a group. The group need not have any visuals. Example:
view-source:Double Tree Layout using a Group as Root

That example also has links connecting the root nodes, but of course your app need not have such links.