I am serving .png tile overlays that periodically change.

In the browser, if one of the tiles someone is currently looking at on
their map canvas has changed, I want to tell the broswer to fetch the
new version of the tile from the server.

I assume this means telling the Google Maps Overlay to refresh itself
somehow?

I saw a request for something like this for Flash API (which I know
nothing about) but is this also avaliable using the javascript api?

Here is where I saw the request: 
http://code.google.com/p/gmaps-api-issues/issues/detail?id=503

Just in case, to make the problem more concrete here is the sequence:

1. "tile_z_x_y" changed on the server -- say from the drawing of a red
polygon from someone's recent disaster assessment report.

2. Periodically based on javascript code, the client sends requests to
the server to compare if the tiles stored in its browser's cache have
changed on the server's database (say with a recorded update time
stamp).

3. If some one is looking at a tile on her browser that doesnt show
the most recent information then the browser needs to somehow fetch
this new overlay, without spending time reloading the whole Google
Maps API.

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