How can I add an object property to the global object in rhino javascript

Question

I have some properties in an object that I would like to add to the global namespace. In javascript on the browser I could just add it to the window object like so:

Answer 1

I've not used rhino but couldn't you just use var?

i.e.

var foo = myObject.foo;
foo();

Edit: Damn knew there'd be a catch! Miles' suggestion would be the go in that case.