Question : Jquery simple tooltip - code example, not plugin

Hi,
Could anyone provide a simple example of a tooltip? I would image it would be fairly easy to do suing positioning - I just cant seem to get it right, especially if I position the div with the tooltip in to the left and my element is on the far left.
Can anyone help?

Cheers
John

Answer : Jquery simple tooltip - code example, not plugin

Why reinvent the wheel???

This one does it all, including testing boundaries

http://plugins.learningjquery.com/cluetip/demo/