How can I adapt CESIUM_BASE_URL in api.js ?

[hededesedede]

I want to use WEbglearth2 as offline.
I did everything and it's working well, except loading tiles. there is no world in the web browser, when I open.

and I understood that I should change CESIUM_BASE_URL in api.js.
CESIUM_BASE_URL = ('https:' == document.location.protocol ? 'https:' : 'http:') + '//www.webglearth.com/v2/';

https://raw.githubusercontent.com/webglearth/webglearth2-offline/gh-pages/v2/api.js

How can I change it, and make completely offline map?

[ColonelBuendia]

old:
// CESIUM_BASE_URL = ('https:' == document.location.protocol ? 'https:' : 'http:') + '//www.webglearth.com/v2/';
new:
CESIUM_BASE_URL = ('https:' == document.location.protocol ? 'https:' : 'http:') + '/v2/';