How to use this TimeLine Gadget...
This gadget is used within a Google spreadsheet to create a visual timeline of dated information. The source spreadsheet must contain the following fields:
description of each event
the start date of the event
the end date of the event (optional)
a URL of an image which should show when the event is clicked
a URL which will appear as a link in the popup when the event is clicked
a descriptin of the event which shows when the event is clicked.