$(function(){
	var div = $('div.sc_menu'),
	ul = $('ul.sc_menu'),
	ulPadding = 15;
	var divWidth = div.width();
	div.css({overflow: 'hidden'});
	var lastLi = ul.find('li:last-child');

$('#sl_left').click(function () {
	var ulWidth = lastLi[0].offsetLeft + lastLi.outerWidth() + ulPadding;
	var left = 40 * (ulWidth-divWidth) / divWidth;
	div.scrollLeft(div.scrollLeft()-left);
});
$('#sl_right').click(function () {
	var ulWidth = lastLi[0].offsetLeft + lastLi.outerWidth() + ulPadding;
	var right = 40 * (ulWidth-divWidth) / divWidth;
	div.scrollLeft(div.scrollLeft()+right);
});

});