You can insert rollover images in your page. A rollover is an image that, when viewed in a browser, changes when the pointer moves across it.
You must have two images to create the rollover: a primary image (the image displayed when the page first loads) and a secondary image (the image that appears when the pointer moves over the primary image). Both images in a rollover should be the same size; if the images are not the same size, Dreamweaver resizes the second image to match the properties of the first image.
Rollover images are automatically set to respond to the onMouseOver event. You can set an image to respond to a different event (for example, a mouse click) or change a rollover image.
For a tutorial on creating rollovers, see www.adobe.com/go/vid0159.