var $window = jQuery(window);	//Window object
var scrollTime = 0.6;			//Scroll time
var scrollDistance = 400;		//Distance. Use smaller value for shorter scroll and greater value for longer scroll

mobile_ie = -1 !== navigator.userAgent.indexOf("IEMobile");

function smoothScrollListener(event){
    event.preventDefault();

    var delta = event.wheelDelta / 120 || -event.detail / 3;
    var scrollTop = $window.scrollTop();
    var finalScroll = scrollTop - parseInt(delta * scrollDistance);

    TweenLite.to($window, scrollTime, { scrollTo: { y: finalScroll, autoKill: !0 }, ease: Power1.easeOut, autoKill: !0, overwrite: 5 });
}

if (!jQuery('html').hasClass('touch') && !mobile_ie) {
    if (window.addEventListener) {
        window.addEventListener('mousewheel', smoothScrollListener, {passive:false});
        window.addEventListener('DOMMouseScroll', smoothScrollListener, {passive:false});
    }
}