[OpenLayers-Users] what is the different between the two image locations: /img and /theme/xx/img

[maven apache]

Hi:

I found that openlayer use two image location, /img and the /theme/xx/img

So what is the difference?

Since now I tried to custom the FramedCloud style which will use different
image 'cloud-popup-relative.png', I know I can drop the new image to the
/img fold to replace the default image, but what about if I want to keep
the default image?

Now this the fold structure:

/img
/theme
   default
        /img
        style.css

/lib
OpenLayers.js

Then I wonder if I can create a new theme, and put the
'cloud-popup-relative.png' to the theme folder like this:

/img
/theme
   default
        /img
        style.css
    ntheme/
        /img
            'cloud-popup-relative.png
/lib
OpenLayers.js

Is this possible?
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