https://jackjilltalentagency.com/wp-content/themes/scent/js/jquery.scrolly.js?ver=1.0

1/*
2 *  Project: Scrolly : parallax is easy as a matter of fact !
3 *  Description: Based on jQuery boilerplate
4 *  Author: Victor C. / Octave & Octave web agency
5 *  Licence: MIT
6 */
7(function ( $, window, document, undefined ) {
8    // Create the defaults once
9    var pluginName = 'scrolly',
10        defaults = {
11            bgParallax: false
12        },
13        didScroll = false;
14
15    function Plugin( element, options ) {
16        this.element = element;
17        this.$element = $(this.element);
18
19        this.options = $.extend( {}, defaults, options) ;
20        
21        this._defaults = defaults;
22        this._name = pluginName;
23        
24        this.init();
25    }
26
27    Plugin.prototype.init = function () {
28        var self = this;
29        this.startPosition = this.$element.position().top;
30        this.offsetTop = this.$element.offset().top;
31        this.height = this.$element.outerHeight(true);
32        this.velocity = this.$element.attr('data-velocity');
33        this.bgStart = parseInt(this.$element.attr('data-fit'), 10);
34
35        $(document).scroll(function(){
36            self.didScroll = true;
37        });
38        
39        setInterval(function() {
40            if (self.didScroll) {
41                self.didScroll = false;
42                self.scrolly();
43            }
44        }, 10);
45    };
46
47    Plugin.prototype.scrolly = function() {
48        var dT =  $(window).scrollTop(),
49            wH = $(window).height(),
50            position = this.startPosition;
51
52        if(this.offsetTop >= (dT+wH)) {
53            this.$element.addClass('scrolly-invisible');
54        } else {
55            if(this.$element.hasClass('scrolly-invisible')){
56                position = this.startPosition + (dT + ( wH - this.offsetTop ) ) * this.velocity;
57            } else {
58                position = this.startPosition + dT  * this.velocity;
59            }
60        }
61        // Fix background position
62        if(this.bgStart){ position = position + this.bgStart; }
63
64        if(this.options.bgParallax === true) {
65            this.$element.css({backgroundPosition: '50% '+position+'px'});
66        } else {
67            this.$element.css({top: position});
68        }
69    };
70
71    $.fn[pluginName] = function ( options ) {
72        return this.each(function () {
73            if (!$.data(this, 'plugin_' + pluginName)) {
74                $.data(this, 'plugin_' + pluginName, new Plugin( this, options ));
75            }
76        });
77    };
78
79})(jQuery, window, document);