addChild :: Then removeChild

Hi,
I am adding a child to the stage in my first swf


addChild(new donkey());
var l:Loader = new Loader();
l.load(new URLRequest("next.swf"));
addChild(l);

in my next.swf, I have a button which I want to remove the donkey with::

removeChild(donkey);

OK - doesnt work - it doesnt let me export the swf anyhow because the next.swf has no ‘reference’ to donkey existing at all. What’s going on?
Thanks!!