[Plugin: SimpleMap Store Locator] Multiple Domains

I have installed SimpleMap and it works great, but I have various domains that are directed to the site. .com/.net/.org. I have acquired a Google Maps API key for all of them, but there is only one location to place the API key under the General Options menu. Every time I load one of the other sites a popup asking for the appropriate API key is displayed. How can I add more than one Google Maps API key to the SimpleMap plugin?

There are several forums online that discuss how to do this through Javascript, but I can’t figure out where SimpleMap is saving the API keys.

Thanks!

http://ww.wp.xz.cn/extend/plugins/simplemap/