A user interface method for user selected zoom level determination. The method includes displaying a page of a document on a screen of the handheld device, and receiving an input from a user of the handheld device and setting a zoom level of the page in accordance there with. The method further includes, in response to the zoom level, processing the page in accordance there with to produce a plurality of dynamically sized segments, and for displaying successive pages on the screen, processing the successive pages to produce additional dynamically sized segments in accordance with the zoom level.