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$('a').click(function(){
    $('html, body').animate({
        scrollTop: $( $.attr(this, 'href') ).offset().top
    }, 500);
    return false;
});

// http://stackoverflow.com/questions/7717527/jquery-smooth-scrolling-when-clicking-an-anchor-link/7717572#7717572?newreg=16ca424bc4024b21a4fcc728ea6451d5