1. A method for displaying a computer-based set of information on a display screen, comprising the steps of: displaying, on the display screen, said set of information as a book image, respective portions of said set of information being displayed as an open page of said book image that overlaps another page that was previously moved from a first side of said book image to a second side of said book image, and open pages of said book image remain at a fixed location with respect to said display screen as different pages of said book image are displayed; and displaying, on the display screen, a thickness image of said book image corresponding to an amount of said information on a left side and a right side of said display screen, a left portion of said thickness image displayed on said left side of said screen being proportional to a first amount of the information preceding a point in said set of information currently being displayed and a right portion of said thickness image displayed on said right side of said display screen being proportional to a second amount of information following the point in said set of information currently being displayed.