var didScroll = false;

        jQuery(window).scroll(function() {
            didScroll = true;
        });

        setInterval(function() {
            if ( didScroll ) {
                didScroll = false;
                var $el = jQuery('#metaslider-background');

                //Same that all the if else statements
                switch (true) {
                    case (window.pageYOffset < 118):
                        if ($el.hasClass('pos-fixed')) {
                          $el.removeClass('pos-fixed');
                          console.log('remove pos-fixed ' + window.pageYOffset);
                        }
                        break;
                    case (window.pageYOffset > 128):
                        if (!$el.hasClass('pos-fixed')) {
                          $el.addClass('pos-fixed');
                          console.log('pos-fixed ' + window.pageYOffset);
                        }
                        break;
                }
            }
        }, 50);