https://ocsalumni.org/wp-content/themes/the-core-parent/js/jquery.parallax.js?ver=1.0.42

1(function ($) {
2    // Check if the section has the parallax class.
3    if ($('.parallax-section').length) {
4        var parallaxItem = $('.parallax-section'),
5            // IE 11 => return version number
6            isIE11 = !!navigator.userAgent.match(/Trident\/7\./);
7        $.browser.device = (/Android|iPad|iPhone|iPod|BlackBerry|Windows Phone|opera mini|iemobile/i.test(navigator.userAgent || navigator.vendor || window.opera));
8
9        // Check if the browser is IE10 or below.
10        if ($.browser.msie || isIE11 > 0 || $.browser.device) {
11            // Remove the parallax scrolling styles and center background image vertically.
12            parallaxItem.css({
13                backgroundAttachment: 'scroll',
14                backgroundPosition: '50% 50%'
15            });
16        }
17        else {
18            parallaxItem.addClass('parallax-started');
19        }
20    }
21
22    $(document).ready(function () {
23        // Cache the Window object
24        $window = $(window);
25
26        $('.parallax-started').each(function () {
27            // assigning the object
28            var $bgobj = $(this),
29                parallaxSpeed = $bgobj.data('parallax-background-speed');
30
31            $(window).scroll(function () {
32                // Scroll the background at var speed
33                // the yPos is a negative value because we're scrolling it UP!
34                var yPos = -(($(window).scrollTop() - $bgobj.offset().top) / parallaxSpeed);
35
36                // Put together our final background position
37                var coords = '50% ' + yPos + 'px';
38
39                // Move the background
40                $bgobj.css({backgroundPosition: coords});
41            });
42            // window scroll Ends
43        });
44    });
45})(jQuery);