Do you know how to build thumbnails on the right side, that when click on, will
enlarge the picture of the thumbnail clicked into a space on the left side.
(Not open another page with the enlarged picture? If so, can you give me a step
by step procedure on how to create within Dreamweaver CS3?

thanks,
Carol

This can be accomplished through Javascript Behaviors in Dreamweaver, like the Change Property Behavior. I suggest you read the in Dreamweaver on that topic.