1. A computer-implemented method, comprising: at a portable multifunction device with a touch screen display, displaying a portion of an electronic document on the touch screen display, wherein the displayed portion of the electronic document has a vertical position in the electronic document and a horizontal position in the electronic document, and wherein the displayed portion of the electronic document comprises a vertical portion of the electronic document and a horizontal portion of the electronic document; detecting a finger on the displayed portion of the electronic document; in response to detecting the finger on the displayed portion of the electronic document, displaying a vertical bar and a horizontal bar on top of the displayed portion of the electronic document, wherein: the vertical bar has a vertical position on top of the displayed portion of the electronic document that corresponds to the vertical position in the electronic document of the displayed portion of the electronic document; the vertical bar has a vertical length that corresponds to the vertical portion of the electronic document being displayed; the horizontal bar has a horizontal position on top of the displayed portion of the electronic document that corresponds to the horizontal position in the electronic document of the displayed portion of the electronic document; and the horizontal bar has a horizontal length that corresponds to the horizontal portion of the electronic document being displayed; detecting a movement of the finger on the displayed portion of the electronic document; in response to detecting the movement, translating the electronic document displayed on the touch screen display so that a new portion of the electronic document is displayed, moving the vertical position of the vertical bar to a new vertical position such that the new vertical position corresponds to the vertical position in the electronic document of the displayed new portion of the electronic document, and moving the horizontal position of the horizontal bar to a new horizontal position such that the new horizontal position corresponds to the horizontal position in the electronic document of the displayed new portion of the electronic document; and after a predetermined condition is met, ceasing to display the vertical bar and the horizontal bar while continuing to display the new portion of the electronic document, wherein the displayed new portion of the electronic document has a vertical extent and horizontal extent that are less than a vertical extent and horizontal extent of the electronic document, respectively.