jQuery code is embedded in the demo I have downloaded, and the goal of the demo is to show how to use the tool. I have tried to remove this code and then tabs do not work.
The use of jQuery was to provide the functionality so you can see it in action. If I felt the need I could easily recreate the tabs on a series of pages that do not require javascript at all.
The only reason this might need javascript involved is if the tabs are changing content on the page without loading a new page, such as swapping out divs in a container.
I believe you are confused about design versus function.