Link Floatie script lets you display a description of a link or related information in an interesting manner.
A DHTML box gradually fades into view and positions itself in the lower right corner of the screen. The box can easily be set to only disappear after the viewer clicks a link, making it possible to use Link Floatie not as a tooltip but an information box.
Furthermore, this box intelligently positions itself at the top of the screen instead of bottom if the floatie obstructs the link's view when the former appears.