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private var oldX,oldY:Number;
private function onMouseMove(event:MouseEvent):void{
if(event.buttonDown){
var x:Number = event.stageX - oldX;
var y:Number = event.stageY - oldY;
oldX = event.stageX;
oldY = event.stageY;
img.move(img.x + x,img.y + y);
oldX = event.stageX;
oldY = event.stageY;
}
}