Is there any way to send value to my attribute through event handler method

Question

While I give value to the img array it does not print while I call object for this class. Is there any way that I could give value for img attribute
// Attribute
public var img:Array;
// Constructor
public function ReadXML(myfile:String) {
            img=new Array();
            xmlFile=myfile;
            var loader:URLLoader=new URLLoader;
            var url:URLRequest=new URLRequest(xmlFile);
            loader.addEventListener(Event.COMPLETE,onXMLLoad);
            loader.load(url);
// Event handling Method
        function onXMLLoad(event:Event):Array {
            var xml:XML=new XML(event.target.data);
            //trace(xml);
            //trace("Number of Contacts : " + xml..person.length());
            //trace("First contact’s favorite food : " + xml.contacts.person[0].@favoriteFood);
            img["height"]=100;
            img["width"]=200;
            return img;

Answer 1

what are you trying to do?
if img has anything to do with an image, explain.
if img is supposed to be an associate array, use:
var img:Object;
img=new Object();
etc