More Presentations sans PowerPoint
You can forward through the slides by clicking on the arrows or anywhere on the page, or by using the arrow keys on the keyboard. If you are using the Opera browser, it will display in the Opera Show format. All in a file that will actually fit on a floppy disk (the 11 slide intro is 95Kb zipped--so you could put several presentations on a floppy and unzip them on the computer you are using to display.) S5 is released under a Creative Commons Attribution/Share-Alike license (essentially, the code free to use and modify as long as you allow others to do the same and credit the Meyers with the original work.)
They have a primer (and more) on the website, which shows the details of modifying the HTML and CSS for your own presentations. If you don't know anything about CSS, this will seem a challenge, but it's much simpler when you don't have to create it from scratch. Really, if you just replace their materials with your content and stay within the div.slide sections (
Try Jenny's presentations to start, as the CSS is simpler, but if you are feeling confident, definitely try the Meyer's S5.