How do you load XML using a variable?

For example. Assume all my code is in place and wokring perfectly.

All I want to do is replace

PHP Code:

myNs.load("news.xml");

with

PHP Code:

myNs.load(news);

Then ad the following line to my html page.

PHP Code:

'FlashVars', 'news=news.xml',

Which is pretty much the way I do this when loading an flv or a swf, without any problems

But apparently, there's more to it than that, when trying to load XML, because it doesn't work.

What am I missing?