Fixed sidebar with respect to header and footer

Script.js

// SCRIPT FOR PRODUCT SIDEBAR STICKY (EXPANDABLE)
            function collision($div1, $div2) {
                if ( $div1.length > 0 && $div2.length > 0 ) {
                    var x1 = $div1.offset().left;
                    var y1 = $div1.offset().top;
                    var h1 = $div1.outerHeight(true);
                    var w1 = $div1.outerWidth(true);
                    var b1 = y1 + h1;
                    var r1 = x1 + w1;
                    var x2 = $div2.offset().left;
                    var y2 = $div2.offset().top;
                    var h2 = $div2.outerHeight(true);
                    var w2 = $div2.outerWidth(true);
                    var b2 = y2 + h2;
                    var r2 = x2 + w2;
                    if (b1 < y2 || y1 > b2 || r1 < x2 || x1 > r2) return false;
                    return true;
                } else {
                    return false;
                }
            }

            if ( $('body').hasClass('page-template-template-product-filter-php') || 
            $('body').hasClass('page-template-template-keep') || 
            $('body').hasClass('page-template-template-rent') || 
            $('body').hasClass('page-template-template-sell') ) {
                $(window).scroll(function(e) {
                    var scroll_top = $(window).scrollTop();
                    var nav_h = $('nav#cc-navbar').outerHeight();
                    var dark_h = $('.cc-filter-dark').outerHeight();
                    var total_h = nav_h + dark_h;

                    if ( collision( $('.navbar-fixed-top.shrink'), $('.cpm-filter-result-open form.filter-form-left') ) || scroll_top >= total_h ) {
                        $('.cpm-filter-result-open #cbp-spmenu-s1').addClass('sticky');
                        $('.cpm-filter-result-open #cbp-spmenu-s1').css({
                            'position': 'fixed',
                            'top' : '75px'
                        });
                    } else {
                        $('.cpm-filter-result-open #cbp-spmenu-s1').removeClass('sticky');
                        $('.cpm-filter-result-open #cbp-spmenu-s1').css({
                            'position': 'static',
                            'top' : '0px'
                        });
                    }

                    if ( collision( $('.cpm-filter-result-open #cbp-spmenu-s1'), $('footer#section-1') ) ) {
                        $('.cpm-filter-result-open #cbp-spmenu-s1').removeClass('sticky');
                        $('.cpm-filter-result-open #cbp-spmenu-s1').css({
                            'position': 'absolute',
                            'bottom' : '0px',
                            'top' : 'auto'
                        });
                    }                    
                });
            }
        // END SCRIPT FOR PRODUCT SIDEBAR STICKY (EXPANDABLE)