I''d suggest a completely different approach, since you're using a regular grid. Display the grid lines if you like, but don't fill in the boxes to obscure the map. When a user clicks, analyse the coordinates and calculate the grid square the click falls in. It's only a case of dividing and checking remainders. This is simple enough to do client-side, or you can transmit the coordinates as-is for server side analysis.
-- You received this message because you are subscribed to the Google Groups "Google Maps API" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-maps-api?hl=en.
