Firstly, I want to remind you that blindly copying content can be dangerous or wrong.
Secondly, around line 444 you see this aptly named function.
Code:
......
function tabberAutomaticOnLoad(tabberArgs)
{
/* This function adds tabberAutomatic to the window.onload event,
so it will run after the document has finished loading.
*/
var oldOnLoad;
......
The comment above clearly states that the function is called after the page loads.
So all the images, external css and js files are loaded first before the ajax call is made.
This makes sense in terms of server requests, page navigation and usage.
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