Scroll to function because zepto doesn't have scrolltop animation

gistfile1.txt

// Scroll function cause zepto doesn't have scrolltop animation
    function scrollNew(scrollTo, time) {
        var scrollFrom = parseInt(document.body.scrollTop),
            i = 0,
            runEvery = 5; // run every 5ms
    
        scrollTo = parseInt(scrollTo);
        time /= runEvery;
    
        var interval = setInterval(function () {
            i++;
            
            document.body.scrollTop = (scrollTo - scrollFrom) / time * i + scrollFrom;
            document.documentElement.scrollTop = (scrollTo - scrollFrom) / time * i + scrollFrom;
    
            if (i >= time) {
                clearInterval(interval);
            }
        }, runEvery);
    }