Google Maps Remote .js and Access-Control-Allow-Origin

Question

Hey there!

I wrote a Google Maps API wrapper in JS, did some local tests with static html, and everything worked just fine. Then I loaded the files into a local web server running in localhost:8080, tested the map panels, and once again, everything worked just fine.

Then a week went by, I added a map to a page, and I couldn't get it to load. Nothing has changed (that I know of anyway, obviously something has), and static tests continue to work just fine, but when I try to load the API from the server I get this in the debug console:

XMLHttpRequest cannot load http://maps.google.com/maps/api/js?sensor=false.
Origin http://localhost:8080 is not allowed by Access-Control-Allow-Origin.

I read a bit around, but I still can't understand the error, much less fix it. Can someone please give me a hand?

edit: I use a simple tag to load google's js. No jQuery, no nothing.

Thanks in advance!