A navigation bar consists of an image (or set of images) whose display changes based on the actions of a user. Navigation bars often provide an easy way to move between pages and files on a site.
A navigation bar element can have four states:
For example, the element in this state looks like it hasnt been clicked.
For example, when a user clicks an element, a new page loads and the navigation bar is still displayed, but the clicked element is darkened to show that its been selected.
For example, the element appears dimmed or gray. You can use this state as a visual clue to users that this element cannot be clicked again while they are in this part of the site.
You dont have to include navigation bar images for all four of these states; for example, you may just want Up and Down states.