n Over: The pointer is over the image.
n Down: The user has clicked the image.
n Over While Down: The user??™s pointer is over the image after it has been clicked.
One key difference separates a fully functioning navigation bar from a group of unrelated rollovers. When
the Down state is available, if the user clicks one of the buttons, any other Down button is changed to the
Up state. The effect is like a series of mutually exclusive radio buttons: You can show only one selected in a
group. The Down state is often used to indicate the current selection.
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Inserting Images 9
Although you can use the Navigation Bar object on any type of Web design, it works best in a
frameset context, with one frame for navigation and one for content. If you insert a navigation
bar with Up, Over, Down, and Over While Down states for each button in the navigation frame, you can target
the content frame and gain the full effect of the mutually exclusive Down states.
Before you can use Dreamweaver??™s Navigation Bar object, you have to create a series of images for each
button??”one for each state you plan to use, as demonstrated in Figure 9-21. It??™s completely up to the
designer how the buttons appear, but it??™s important that a consistent look and feel be applied to all the buttons
in a navigation bar.
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