1. A method to control a computer generated presentation on a display screen, wherein the presentation includes displaying multiple screen images in a presentation order at one or more different locations and at one or more different zoom levels on a canvas within a zooming user interface and wherein the presentation includes displaying panning and zooming between the screen images, the method comprising: providing on the display screen multiple respective thumbnail images that correspond to the multiple screen images displayed within the presentation; in response to receipt of user input selecting one thumbnail image followed by receipt of user input selecting another of the thumbnail image, displaying on the display screen a screen image that corresponds to the user selected one thumbnail image followed by display on the display screen of another thumbnail image that corresponds to the user selected another thumbnail image and display of at least one of panning and zooming between display of the one thumbnail image and the another thumbnail image.