Web designers use images to improve a page’s design, decorate navigation bars, highlight elements on a page—and to show the world what fun they had on their last vacation. Adding an image to a web page immediately injects interest and visual appeal. When you add JavaScript to the mix, however, you can really add excitement by dynamically changing images on a page, presenting an animated photo gallery, or showing off a series of photos in a self-running slideshow. In this chapter, you’ll learn a slew of tricks for manipulating and presenting images on your website.