What is the best way to get a custom attribute of an asset ?

What is the best way to get a custom attribute of an asset?

For Example, here's the XML:
<page id="intro" title="Intro" src="intro.swf" >
   <asset id="introMusic" src="intro_audio.mp3"  _volume=".2" />
</page>

and I want to set the volume of the Sound Asset to the value of the attribute I created as "_volume".

I wish it were as simple as this:
assets.introMusic.volume = assets.introMusic.@_volume ;  //  DOES NOT WORK.


What is the best and proper way to do this?

Thanks in advance,
-HaunGO

ok, so i just needed ".node" and it all works out.

assets.introMusic.node.@_volume

 

Code:

assets.introMusic.volume = assets.introMusic.node.@_volume;

Might want to wrap it in Number() but I guess you don't have to?