synchronized void add(Component imgLabel,String imageUrl){
  if (started) {
    throw new IllegalStateException("ResourceThreadQueue already started! stop/cancel first");
  }
  images.put(imgLabel,imageUrl);
}

synchronized void add ( Component imgLabel , String imageUrl ) { if ( started ) { throw new IllegalStateException ( "ResourceThreadQueue already started! stop/cancel first" ) ; } images . put ( imgLabel , imageUrl ) ; }
adds the image to the queue
