Graphical user interface for a mobile computer system accesses a data base of products. On the display screen of the mobile computer system, a central image of a product is presented in a central position of the display. A first image of another product is presented on the display to a first side of central position of the display. A second image of another product is presented on the display on the second side of central position of the display. The second side of the display is opposite the first side with respect to the central position. A product image when presented in the central position is scaled to be significantly larger than a corresponding product image when presented on the first and second sides of the central position.