A first user interface is displayed without concurrently displaying a second user interface that is distinct from the first user interface. A gesture to select the second user interface is detected on the touch screen display. In response to detecting the gesture, an animation is displayed of a transition from display of the first user interface to display of the second user interface. The animation comprises sliding a first element of the second user interface onto the display from a first side of the display while simultaneously sliding a second element of the second user interface that contacts the first element horizontally across the top of the first element. The first element of the second user interface is distinct from the second element of the second user interface.