You can convert a pixel coordinate into a latitude and longitude fairly 
easy. One thing you need to consider. All pixel coordinates are based on a 
particular zoom level. If all your pixel coordinates are assuming one static 
layer, you'll have to figure out what corresponding zoom that represents and 
calculate latitude and longitude based on that.

Here's a Perl module with the tile math.

http://www.usnaviguide.com/google-tiles.htm

Hope that helps.

-John Coryat

http://maps.huge.info

http://www.usnaviguide.com

http://www.zipmaps.net

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