Help! Glider stopped working

All of a sudden, since yesterday the glider on my website stopped working. I didn’t install any pluging and the 2 I’ve updated (Blog protector and Ajax Edit Comment) i’ve deactivated, but that didn’t bring any solution.

IE gives the following error (but the glider stopped in Firefox and Chrome as well):
Regel: 18
Teken: 6
Code: 0
URI: https://www.denhelderactueel.nl/wp-content/themes/vn-news/scripts/glider.js

The script for glider.js is:
/**
* @author Bruno Bornsztein <[email protected]>
* @copyright 2007 Curbly LLC
* @package Glider
* @license MIT
* @url https://www.missingmethod.com/projects/glider/
* @version 0.0.3
* @dependencies prototype.js 1.5.1+, effects.js
*/

/* Thanks to Andrew Dupont for refactoring help and code cleanup – https://andrewdupont.net/ */

Glider = Class.create();
Object.extend(Object.extend(Glider.prototype, Abstract.prototype), {
initialize: function(wrapper, options){
this.scrolling = false;
this.wrapper = $(wrapper);
this.scroller = this.wrapper.down(‘div.scroller’);
this.sections = this.wrapper.getElementsBySelector(‘div.section’);
this.options = Object.extend({ duration: 1.0, frequency: 3 }, options || {});

this.sections.each( function(section, index) {
section._index = index;
});

this.events = {
click: this.click.bind(this)
};

this.addObservers();
if(this.options.initialSection) this.moveTo(this.options.initialSection, this.scroller, { duration:this.options.duration }); // initialSection should be the id of the section you want to show up on load
if(this.options.autoGlide) this.start();
},

addObservers: function() {
var controls = this.wrapper.getElementsBySelector(‘div.controls a’);
controls.invoke(‘observe’, ‘click’, this.events.click);
},

click: function(event) {
this.stop();
var element = Event.findElement(event, ‘a’);
if (this.scrolling) this.scrolling.cancel();

this.moveTo(element.href.split(“#”)[1], this.scroller, { duration:this.options.duration });
Event.stop(event);
},

moveTo: function(element, container, options){
this.current = $(element);

Position.prepare();
var containerOffset = Position.cumulativeOffset(container),
elementOffset = Position.cumulativeOffset($(element));

this.scrolling = new Effect.SmoothScroll(container,
{duration:options.duration, x:(elementOffset[0]-containerOffset[0]), y:(elementOffset[1]-containerOffset[1])});
return false;
},

next: function(){
if (this.current) {
var currentIndex = this.current._index;
var nextIndex = (this.sections.length – 1 == currentIndex) ? 0 : currentIndex + 1;
} else var nextIndex = 1;

this.moveTo(this.sections[nextIndex], this.scroller, {
duration: this.options.duration
});
},

previous: function(){
if (this.current) {
var currentIndex = this.current._index;
var prevIndex = (currentIndex == 0) ? this.sections.length – 1 :
currentIndex – 1;
} else var prevIndex = this.sections.length – 1;

this.moveTo(this.sections[prevIndex], this.scroller, {
duration: this.options.duration
});
},

stop: function()
{
clearTimeout(this.timer);
},

start: function()
{
this.periodicallyUpdate();
},

periodicallyUpdate: function()
{
if (this.timer != null) {
clearTimeout(this.timer);
this.next();
}
this.timer = setTimeout(this.periodicallyUpdate.bind(this), this.options.frequency*1000);
}

});

Effect.SmoothScroll = Class.create();
Object.extend(Object.extend(Effect.SmoothScroll.prototype, Effect.Base.prototype), {
initialize: function(element) {
this.element = $(element);
var options = Object.extend({
x: 0,
y: 0,
mode: ‘absolute’
} , arguments[1] || {} );
this.start(options);
},
setup: function() {
if (this.options.continuous && !this.element._ext ) {
this.element.cleanWhitespace();
this.element._ext=true;
this.element.appendChild(this.element.firstChild);
}

this.originalLeft=this.element.scrollLeft;
this.originalTop=this.element.scrollTop;

if(this.options.mode == ‘absolute’) {
this.options.x -= this.originalLeft;
this.options.y -= this.originalTop;
}
},
update: function(position) {
this.element.scrollLeft = this.options.x * position + this.originalLeft;
this.element.scrollTop = this.options.y * position + this.originalTop;
}
});

Hopefully someone can help me out here, thanks!