I want to use one html file to display different images on the page by clicking two buttons. This button is named forward. The other button is named backward which will go render the previously displayed image.

Letís use http://light_wt.tripod.com/ff/pages/jr038.htm as an example. When the right arrow is clicked, a new page is displayed. What I need is no change on the html page. Only update the image where the red cross is located. So, jr039.html will display the image in jr040. and etc.

Currently the directory structure is: