Load only the markers that are not already set on the map

Hi,

I was able to code with Google Maps API v3, a small app. that gets the
markers from JSON string send from the server every time the bound
changes. The markers appear but if I change the view bound it reloads
the same markers... So they are there in double...

So is there a way to know if the marker is already on the map? If yes
just not load it on the map another time.

There is I would believe another way of approaching the problem... It
is to remove all the markers from the map then load the fresh new ones
from the server... It would work... But I want to make a editor where
my friend can change the place of the markers and I don't want them to
be changed or remove or replace...

Here is the link of my demo: http://jean-nicolas.name/labs/google_maps/google_map_v3_2.html

Thanks in advance for you time.

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