Add slide function to website page

I have a 1 page website. The homepage is already sliced and the HTML index file already exists. I want to modify the code so that 1 of the slices will change every 2 or 3 seconds with different images (anywhere from 10 - 20 different images). I would like the jpgs for the changing slides to go into a subfolder called "slides" which I can then add and delete slides as desired. (The slides will be named [login to view URL], [login to view URL], [login to view URL], etc. The code should not refer to a specific image but rather to all jpgs within the subfolder so if there are 10 images the 10 images will show, if there are 20 20 images will show.) The slide show will loop endlessly. I would like this done in HTML5. Other then the above requested work you will not be allowed to add any other information to the code (copyright, author, etc) and the code will be checked.