a better, more reliable wheel scrolling script... maybe a refactor?

$(function() {function handle(delta) {
    if (delta < 0) {
        $(".SA").scrollTo({
            top: '+=65px',
            left: '+=0px'
        },
        {
            offset: -0
        });
    } else {
        $(".SA").scrollTo({
            top: '-=65px',
            left: '+=0px'
        },
        {
            offset: -0
        });
    }
}
function wheel(event) {
    var delta = 0;
    if (!event) event = window.event;
    if (event.wheelDelta) {
        delta = event.wheelDelta / 120;
        if (window.opera) delta = -delta;
    } else if (event.detail) {
        delta = -event.detail / 3;
    }
    if (delta) handle(delta);
    if (event.preventDefault) event.preventDefault();
    event.returnValue = false;
}
if (window.addEventListener) window.addEventListener('DOMMouseScroll', wheel, false);
window.onmousewheel = document.onmousewheel = wheel; (function(h) {
    var m = h.scrollTo = function(b, c, g) {
        h(window).scrollTo(b, c, g)
    };
    m.defaults = {
        axis: 'y',
        duration: 1
    };
    m.window = function(b) {
        return h(window).scrollable()
    };
    h.fn.scrollable = function() {
        return this.map(function() {
            var b = this.parentWindow || this.defaultView,
            c = this.nodeName == '#document' ? b.frameElement || b: this,
            g = c.contentDocument || (c.contentWindow || c).document,
            i = c.setInterval;
            return c.nodeName == 'IFRAME' || i && h.browser.safari ? g.body: i ? g.documentElement: this
        })
    };
    h.fn.scrollTo = function(r, j, a) {
        if (typeof j == 'object') {
            a = j;
            j = 0
        }
        if (typeof a == 'function') a = {
            onAfter: a
        };
        a = h.extend({},
        m.defaults, a);
        j = j || a.speed || a.duration;
        a.queue = a.queue && a.axis.length > 1;
        if (a.queue) j /= 2;
        a.offset = n(a.offset);
        a.over = n(a.over);
        return this.scrollable().each(function() {
            var k = this,
            o = h(k),
            d = r,
            l,
            e = {},
            p = o.is('html,body');
            switch (typeof d) {
            case 'number':
            case 'string':
                if (/^([+-]=)?\d+(px)?$/.test(d)) {
                    d = n(d);
                    break
                }
                d = h(d, this);
            case 'object':
                if (d.is || d.style) l = (d = h(d)).offset()
            }
            h.each(a.axis.split(''),
            function(b, c) {
                var g = c == 'x' ? 'Left': 'Top',
                i = g.toLowerCase(),
                f = 'scroll' + g,
                s = k[f],
                t = c == 'x' ? 'Width': 'Height',
                v = t.toLowerCase();
                if (l) {
                    e[f] = l[i] + (p ? 0 : s - o.offset()[i]);
                    if (a.margin) {
                        e[f] -= parseInt(d.css('margin' + g)) || 0;
                        e[f] -= parseInt(d.css('border' + g + 'Width')) || 0
                    }
                    e[f] += a.offset[i] || 0;
                    if (a.over[i]) e[f] += d[v]() * a.over[i]
                } else e[f] = d[i];
                if (/^\d+$/.test(e[f])) e[f] = e[f] <= 0 ? 0 : Math.min(e[f], u(t));
                if (!b && a.queue) {
                    if (s != e[f]) q(a.onAfterFirst);
                    delete e[f]
                }
            });
            q(a.onAfter);
            function q(b) {
                o.animate(e, j, a.easing, b &&
                function() {
                    b.call(this, r, a)
                })
            };
            function u(b) {
                var c = 'scroll' + b,
                g = k.ownerDocument;
                return p ? Math.max(g.documentElement[c], g.body[c]) : k[c]
            }
        }).end()
    };
    function n(b) {
        return typeof b == 'object' ? b: {
            top: b,
            left: b
        }
    }
})(jQuery);

Select allOpen in new window