How can I control my external SWF width & height as per my requirement?

Hi,

I have the following code which loads the external SWF (It is working fine). What I need now is to change its Width & Height according to my requirement. How can I modify the code?

var X1pos:Number = 0;
var Y1pos:Number = 0;
var SWF1:MovieClip;
var loader1:Loader = new Loader();


var defaultSWF:URLRequest = new URLRequest("Objects/Cubes.swf");


loader1.load(defaultSWF);
loader1.x = X1pos;
loader1.y = Y1pos;


addChild(loader1);

Thanks in advance for any help.