If you're using an event listener to open the infoWindow, then at the time the event is fired remember the current map bounds. Use another listener on the closeclick to reset the map back. Can't say for sure if this will work as I haven't tried it, but it sounds reasonable. If this doesn't work for you, make sure to post back with a URL to the map...
-John Coryat http://maps.huge.info http://www.usnaviguide.com http://www.zipmaps.net
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