Xml - how do I pull info into flash from specific line in XML?

snd.onLoad = function(success:Boolean){
this._sound.loadSound.start(snd.node.parentNode.firstChild);
}

I’m trying to add an onLoad function to get my xml playlist to start playing through right at site load. I’ve read through like a billion stinkin tutorials and everything is telling me how to load in sound… But I need to load the first track from the xml…

any help would be great, thanks