Preloader loaderInfo variables

How can I pass loaderInfo parameters from a preloader to the child .swf that it loads in and adds to the stage?

I’m grabbing variables from a Facebook page loader for my app, but now I want to put in a preloader, so I need to get those vars passed down…

At the moment I’m getting the vars object like this:

private var paramObj:Object = LoaderInfo(root.loaderInfo).parameters;

In my preloader, I’m using a loader object with an onComplete handler which then presents the actual app using addChild.