document.addEventListener('DOMContentLoaded', function (){ 
var $root = document.documentElement; 
var $alo = document.getElementById('alo'); 
var $bsaShadow = document.getElementById('bsaShadow'); 
var toTravel = $root.scrollHeight - window.innerHeight; 
var fromTop = $alo.offsetTop; 
var menuThrottle = null ; 
if ($alo) { 
document.addEventListener('scroll', function (event){ 
var scrollTop = window.scrollY; 
setBsa(scrollTop); 
clearTimeout(menuThrottle); 
throttle = _AN_Call_settimeout('setTimeout', window, setBsaShadows(scrollTop), 100); 
} 
); 
function setBsaShadows(scrollTop){ 
var distance = toTravel - scrollTop; 
var topFactor = 1 - (distance / toTravel); 
$bsaShadow.style.opacity = topFactor; 
$bsaShadow.style.transform = 'scaleY(' + topFactor + ')'; 
} 
function setBsa(scrollTop){ 
if (scrollTop >= fromTop) { 
$alo.classList.add('is-fixed'); 
} 
 else { 
$alo.classList.remove('is-fixed'); 
} 
} 
setBsaShadows(0); 
} 
} 
);