va inserito dentro la pagina specifica

<script src="https://code.jquery.com/jquery-2.1.3.min.js">
</script><script type="text/javascript">
$(function() {$('a[href*=#]:not([href=#])').click(function() {if (location.pathname.replace(/^\//,'') == this.pathname.replace(/^\//,'') && location.hostname == this.hostname) {var target = $(this.hash);target = target.length ? target : $('[name=' + this.hash.slice(1) +']');if (target.length) {$('html,body').animate({scrollTop: target.offset().top}, 1000);return false;}}});});
</script>

si aggiunge un nuovo blocco di codice

<a name="special"></a>