jquery : smooth scroll

gistfile1

$(document).ready(function() {
    // animation of navigation
    $(function() {
        $('.nav-collapse .nav li a').bind('click',function(event){

            var anchor = $(this);
            
            $('html, body').stop().animate({
                scrollTop: $(anchor.attr('href')).offset().top - $('.navbar-inner').height() - ($('.navbar-inner').height()/4.8) 
            }, 1500/*,'easeInOutExpo'*/);

            event.preventDefault();
        });
    });
});