There are plenty of solutions at DynamicDrive.com.
They will show you examples and instructions are VERY EASY to follow:
Image Slideshows:
http://www.dynamicdrive.com/dynamicindex14/index.htmlI love the "Swiss Army Image Slideshow" but you may want to check out the "Left-Right Image Slideshow Script". They both involve a single file to run. I don't like it when it takes 5-10 files to run a simple script.