Hey Fredrik,
I've just followed the way Traffic is added to the map.. and it has a Weather button just like the Traffic button... even more, it has some nice styled maps included and OSM activated as well...
Here is the modified Google Map plugin... maybe you are able to check and improve my pretty lame coding...
http://ggs.scorpiontrack.ro/Google_Maps.zip
Cheers,
For anyone else, just unzip and replace Google Maps folder in IIS\Resources\ScriptPlugins\com.GpsGate\ on your server, then reload the application clearing your browser's cache. Make sure you have a backup of the original Google Maps folder before doin' anything fancy...
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