Hi.
The tooltips are not part of the HTML DOM they are standard
'application' tooltips.
Same as the tooltips that appear when i hover my mouse over the Home
button in my browser for example.
Mike's page here is about API v2 but it's still relevant for v3:
http://econym.org.uk/gmap/tooltips.htm
[quote]
These types of tooltip are plain text. You can't apply any formatting
to them. If you want to change the style, position or duration you'll
need to use custom tooltips.
[/quote]
Adding a title attribute to an HTML image element should work the same
as a marker tooltip i would have thought?
Martin.