Reload Code for Highslide JS (partially solved)

Hi,

Relative to Highslide JS plugin:
https://www.scrollleiste.de/web/highslide-integration-in-wordpress
https://highslide.com/

I managed to get the reload code in order to expand the image when click the thumb:

jQuery(document).ready(function() {
jQuery('.ngg-gallery-thumbnail a').each(function() {
	jQuery(this).addClass('highslide');
});

jQuery('.highslide').each(function() {
    jQuery(this).click(function() {
       return hs.expand(this);
    });
});
});

But I still having problems with the expanded image controls (prev, play slideshow, next). The related event is the same for all these buttons:

function() {
	sls[btn]();
	return false;
};

It seems like they are internally binded…

Any suggestion?

Thanks

The page I need help with: [log in to see the link]