1. An image viewing system comprising: a source of anatomical images; a computer configured to generate a graphical user interface having a first window in which at least one anatomical image from the source of anatomical images is displayed, and an image-navigation map including one or more thumbnail images of one or more of the anatomical images from the source of anatomical images, and display the image-navigation map in a foreground of the first window and the at least one anatomical image from the source of anatomical images in a background of the first window so that the image-navigation map is overlaid upon the at least one anatomical image; and a screen connected to the computer and configured to display the graphical user interface.