http://blog.medianotions.de/en/articles/2009/smoothscroll-for-jquery
$(document).ready(function(){$('a[href*=#]').click(function(){var a=1500;var b='swing';if(location.pathname.replace(/^\//,'')==this.pathname.replace(/^\//,'')&&location.hostname==this.hostname&&this.hash.replace(/#/,'')){var c=this.hash;var d=$(c).offset().top;$("html:not(:animated),body:not(:animated)").animate({scrollTop:d},a,b,function(){location.hash=c});return false}})});