$(function(){

        var div = $('div.sc_menu'),

            ul = $('ul.sc_menu'),

            ulPadding = 0;

        var divWidth = div.width();

        div.css({overflow: 'hidden'});

        var lastLi = ul.find('li:last-child');

        div.mousemove(function(e){

            var ulWidth = lastLi[0].offsetLeft + lastLi.outerWidth() + ulPadding;	

            var left = (e.pageX - div.offset().left) * (ulWidth-divWidth) / divWidth;

            div.scrollLeft(left);

        });

    });