The Seadragon Ajax Library provides an API for adding custom controls (images or other HTML) onto the viewer. The viewer then controls the visibility and positioning of those controls, even when going back and forth from fullpage mode. In this example, we add a text link that randomly pans and zooms.
If you would like to learn more about Seadragon.Viewer.addControls(...), please refer to the
Seadragon.Viewer class reference.