Проще всего -
jQueryjQuery(document).on("click",".linkclass",function(e){
e.preventDefault();
$('body').scrollTo(jQuery(e.currentTarget).attr("href"));
return false;
});
$.fn.scrollTo = function( target, options, callback ){
if(typeof options == 'function' && arguments.length == 2){ callback = options; options = target; }
var settings = $.extend({
scrollTarget : target,
offsetTop : 50,
duration : 500,
easing : 'swing'
}, options);
return this.each(function(){
var scrollPane = $(this);
var scrollTarget = (typeof settings.scrollTarget == "number") ? settings.scrollTarget : $(settings.scrollTarget);
var scrollY = (typeof scrollTarget == "number") ? scrollTarget : scrollTarget.offset().top + scrollPane.scrollTop() - parseInt(settings.offsetTop);
scrollPane.animate({scrollTop : scrollY }, parseInt(settings.duration), settings.easing, function(){
if (typeof callback == 'function') { callback.call(this); }
});
});