Slide show gallery not working on home page

I have a slider on the front page that someone created for me. For some reason it stopped working. I am wondering if someone can help me out and tell me why or tell me how to put a new slide show on their?

the site is https://www.fightstylez.com
I have this code in my index.php file that I think is the slider:
<div id=”left”>
<div id=”slider”>
<?php // if (class_exists(‘Gallery’)) { $Gallery = new Gallery(); $Gallery -> slideshow($output = true, $post_id = null); } ?>
<?php { nggSlideshowWidget(6,600,285); }?>

</div>

I “think” it is an older version of nextgen gallery but not sure. That might be the problem, but not sure if I am supposed to update the gallery/slide show or what is wrong?

Any help would be appreciated. I have already read and tried a bunch of things and I am stuck.

Thank You.