Question

How to scroll to div (e.g: #about, #contact) after click on About or Contact in my menu?

<div class="masthead">
    <ul class="nav nav-pills pull-right">
        <li class="active"><a href="#">Home</a></li>
        <li><a href="#">About</a></li>
        <li><a href="#">Contact</a></li>
    </ul>
    <h3 class="muted">Name site</h3>
</div>

Answer 1

Your html:

<div class="masthead">
    <ul class="nav nav-pills pull-right">
        <li class="active"><a href="#">Home</a></li>
        <li><a href="#about">About</a></li>
        <li><a href="#contact">Contact</a></li>
    </ul>
    <h3 class="muted">Name site</h3>
</div>
<div id="about">about</div>
<div id="contact">contact</div>

Your javascript:

$('ul.nav').find('a').click(function(){
    var $href = $(this).attr('href');
    var $anchor = $('#'+$href).offset();
    window.scrollTo($anchor.left,$anchor.top);
    return false;
});

If you want to use animate, replace

window.scrollTo($anchor.left,$anchor.top);

by

$('body').animate({ scrollTop: $anchor.top });