jQuery mouse scroll script speed will not change

had a google....

Tried changing my website scroll settings & nothing is happening.

Anyone have a write up or table on mouse scroll jQuery scripts and functions?

(Caches were cleared, cross browser test etc.)

jQuery(window).load(function(){  

    if(checkBrowser() == 'Google Chrome' && device.windows()){

        if (window.addEventListener) window.addEventListener('DOMMouseScroll', wheel, false);

            window.onmousewheel = document.onmousewheel = wheel;



            var time = 330;

            var distance = 300;


            function wheel(event) {

                if (event.wheelDelta) delta = event.wheelDelta / 90;

                else if (event.detail) delta = -event.detail / 3;

                handle();

                if (event.preventDefault) event.preventDefault();

                event.returnValue = false;

            }



            function handle() {

                jQuery('html, body').stop().animate({

                    scrollTop: jQuery(window).scrollTop() - (distance * delta)

                }, time);

            }

    }

});

function checkBrowser(){

    var ua = navigator.userAgent;



    if (ua.search(/MSIE/) > 0) return 'Internet Explorer';

    if (ua.search(/Firefox/) > 0) return 'Firefox';

    if (ua.search(/Opera/) > 0) return 'Opera';

    if (ua.search(/Chrome/) > 0) return 'Google Chrome';

    if (ua.search(/Safari/) > 0) return 'Safari';

    if (ua.search(/Konqueror/) > 0) return 'Konqueror';

    if (ua.search(/Iceweasel/) > 0) return 'Debian Iceweasel';

    if (ua.search(/SeaMonkey/) > 0) return 'SeaMonkey';

    if (ua.search(/Gecko/) > 0) return 'Gecko';

    return 'Search Bot';

}