I think you would just need to look at the html file you're using and see what WebViewer JavaScript files are being loaded and then inside those files you could wrap the code inside like they mention in your link:
(function($) {
// Inside of this function, $() will work as an alias for jQuery()
// and other libraries also using $ will not be accessible under this shortcut
})(jQuery);
Instead of above you may also just be able to add this after the jQuery script has been loaded and before other scripts are loaded:
We don't have a list with everything we're using but the ones I know of are:
draggable, resizable, selectable, button, dialog, slider, tabs
There may be more so let me know if this turns out to be a problem
Matt Parizeau
Software Developer
PDFTron Systems Inc.