Smooth Scroll mousewheel easing

// Depency on Jquery + http://gsgd.co.uk/sandbox/jquery/easing/jquery.easing.1.3.js [Must Include]
 
if (window.addEventListener) window.addEventListener('DOMMouseScroll', wheel, false);
window.onmousewheel = document.onmousewheel = wheel;
 
function wheel(event) {
    var delta = 0;
    if (event.wheelDelta) delta = event.wheelDelta / 120;
    else if (event.detail) delta = -event.detail / 3;
 
    handle(delta);
    if (event.preventDefault) event.preventDefault();
    event.returnValue = false;
}
 
function handle(delta) {
    var time = 1000; // delay time
    var distance = 300; // delta point 
    // Dom where it will apply 
    $('html, body').stop().animate({
        scrollTop: $(window).scrollTop() - (distance * delta)
    }, time );
}