By default, the page opens so that a pair of illustrations fits across the window. The "Then" view is in the bottom-left frame, and the corresponding "Now" view is in the bottom-right frame.

To use:

• click the Next (Next slides) button at the top of the page to advance slides in each frame,
• click the Prev (Previous slides) button at the top of the page to go back in each frame,
• click the Reset button at the top of the page to return to slide 1 in each frame.

Note you can move frame boundaries to e.g. reduce size of header, or make one picture bigger than the other.

You may also use the buttons on the individual bottom frames.  For example:

• To download the full set of slides, set both slideshows on "Play Slideshows" and then go and make a cup of coffee - then see fast slideshow while you drink it!
• Manually advance one slideshow only, so you can (e.g.) compare one "Then" south view, with any "Now" south view you wish

You may also devise other useful ways of viewing to meet you own needs.

Future Possibilities:  I may add buttons to the top header to provide a synchronised slide show.  Could make all buttons in the top header even more like the Webshots buttons, with changing colours on hover, and a gradient background.