I'm totally new to Google Maps API and could use some help.  I'm
trying to figure out how to draw a polygon with a certain diameter in
meters around a particular point.  I've borrowed code from several
examples to get where I'm at now:

http://grape.host56.com/map_it_2.htm?lat=+040.2735&lon=-076.884&cof=1200

I'm passing the lat, lon, and diameter provided in meters in the URL.
The diameter appears to be in pixels in the code, but I need it in
meters.

Ultimately, this map will be the only thing on a webpage for the user
to see.  They'll have the ability to zoom in and out and pan, but
never move the point.  So I'm also curious how to handle the zooming
and panning around.  Will I need to recalculate the circle after each
move?  What's the best way to accomplish that?

Thanks for your expertise!

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