Draggable timeline.
Creates a Timeline inside contentDiv. optObj may contain these options:
Adds a data band to chart. The band is identified by name and labeled with label.
Adds new event to Timeline, resp. to its band bandName. endTime can be false
, when the event has no duration.
content is a HTML element; color is a background color for time strip (only when endTime != false).
Draws the timeline.