code: public static void synchronizeViewers(ImageViewer first, ImageViewer... others) {
  		Synchronizer mainSynchronizer=first.getSynchronizer();
  		for (ImageViewer other: others) {
  			mainSynchronizer.add(other);
  		}
  	}
docs: Synchronizes the view state of multiple image viewers with respect to scroll position
  and resize strategy, and other properties affecting display.
  @param first the first viewer
  @param others the other viewers