$(function() {
                $('#head a').bind('click',function(event){
                    var $anchor = $(this);
                    /*
                    if you want to use one of the easing effects:
                    $('html, body').stop().animate({
                        scrollLeft: $($anchor.attr('href')).offset().left
                    }, 1500,'easeInOutExpo');
                     */
                    $('html, body').stop().animate({
                        scrollLeft: $($anchor.attr('href')).offset().left
                    }, 1000,'easeInOutExpo');
                    event.preventDefault();
                });
            });