If you don't have powergallery, the best way is to use a jquery slideshow plugin,
There are hundreds of them out there, and many of them are free.
just google 'jquery slideshows'
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.