AS2 FullScreen BG

Hello All,

I am making a Full Screen flash site and I need my BG to scale proportionately. Currently I am using:


_root.attachMovie("bg3","bg3",_root.getNextHighestDepth());
bg3._x = Stage.width/2;
bg3._y = Stage.height/2;
function bgSize()
{
    bg3._width = Stage.width;
    bg3._height = Stage.height;        
}
bgSize();
var StageLis:Object = new Object();
StageLis.onResize = function() 
{
    bgSize();
};
Stage.addListener(StageLis);

But like I said I need it to scale proportionately. Can anyone help?

Thanks in advance,

neonreel