What I do is build a new maptype with a special "always exists" base 
layer, then the Google map type, then my tiles on the top.

The API will render regions for which the middle layer tiles don't 
exist, as long as the base layer tiles exist.

It might sound like it might be inefficient, but I use the same blank 
image for all tiles on the base layer. Once the API has loaded that 
image into cache, that layer loads very quickly.

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



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