Thanks William!  That worked.

Do you also have a pointer for my second question, Regarding my second
question:
  What's the html to reference a marker (and trigger the balloon)
  from outside the map, on the same page? ie: <A HREF="???">Mary</A>

Many thanks
John

On Apr 24, 1:25 am, William <[email protected]> wrote:
> On Apr 24, 9:20 am, JohnH <[email protected]> wrote:
>
> >  I'm making an API V3 map which contains multiple markers,
> > and am having no luck finding V3 documentation on how to close the old
> > balloon-tip when a new marker is clicked and new balloon appears (in
> > other words, so that only one balloon is ever displayed).
>
> you will need to create only one InfoWindow, and set the content
> before opening it, something like this:
>
> var infowindow = new google.maps.InfoWindow();
>
> google.maps.event.addListener(marker1, 'click', function() {
>   infowindow.setContent('Hello Mary');
>   infowindow.open(map, marker1);
>
> });
>
> google.maps.event.addListener(marker2, 'click', function() {
>   infowindow.setContent('Hello Fred');
>   infowindow.open(map, marker2);
>
> });
>
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