There are a couple of ways to create rotating pictures on your site.
1. You can create a GIF file (there are several online apps that will help you do this) and then upload the GIF file to your website.
2. If you have a lot of pictures that you want to rotate, you could create a Flickr site and then embed the Flickr album on your site. This is pretty easy to do and there are several online tools available that will help you with the process. Or you can find more information in our article: Embedding a Flickr Album or Slideshow.