Adds four buttons to the status bar. One to go forward to the next webpage or image in a series, one to go backward, one to go to the start, and one to display a gallery. Works on pages that are numbered sequentially. Works both with and without zero-padded.
To test, navigate to one of these:
and then press the buttons in the bottom-right corner to go to the next or previous image or to open a gallery of photos. Notice that if you go backward from flower10.jpg, it knows whether to go to flower09.jpg or flower9.jpg automatically!