var lastScrollTop = window.pageYOffset || document.documentElement.scrollTop;
        var adxp_sticky = document.querySelector('.adxp-sticky');
        var isMobile = /iPhone|iPad|iPod|Android/i.test(navigator.userAgent);
        var isItClosed = false;
        if (isMobile) {
            window.addEventListener("scroll", function(){
                var st = window.pageYOffset || document.documentElement.scrollTop;
                if (isItClosed != true){
                    if (st > lastScrollTop){ 
                        adxp_sticky.style.height = '150px';
                        adxp_sticky.firstElementChild.innerHTML  = 'X'; 
                    } else {    
                        adxp_sticky.style.height = '250px'; 
                        adxp_sticky.firstElementChild.innerHTML  = 'X'; 
                    } 
                    lastScrollTop = st <= 0 ? 0 : st; 
                    adxp_sticky.style.display = adxp_sticky.children[2].style.display;
                }
            }, false);
        }