Those dots are not GMarkers, they're a GLayer. That layer consists of 
three parts:

1.  A GTileLayerOverlay that displays tiles like this:

   http://mlt0.google.com/mapslt?lyrs=lmq:8:pizza*,|s:11259793464583361879
9|h:2b|cc:FR&x=4147&y=2817&z=13&w=256&h=256&gl=fr&hl=fr

2. a mechanism for obtaining the infowindow details for clicked hotspots

3. a mechanism for changing the cursor when the mouse is over a hotspot


At present there's no interface for creating custom GLayers, so to do 
the same sort of thing you'd have to do the three sections separately.

1. You'll need a server that can search your database and create a 
suitable tile image with just the hotspots shown. Use that server to 
supply the tiles for a GTileLayerOverlay.

2. The easiest way to do that is to listen for all map clicks and send 
the coordinates to a server which scans your database and returns the 
infowindow details if there's a hotspot at that location.

3. Is quite tricky, but has been discussed in the group before, so 
search the group when you get that far.

-- 
Mike Williams
http://econym.org.uk/gmap



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