I have updated your fiddle, Now its working fine
Working Demo
jQuery
jQuery(document).ready(function ($) {
$('.nav a').click(function (e) {
e.preventDefault();
$(this).tab('show');
})
$('a.scroll').on('click', function (e) {
var href = $(this).attr('href');
$('html, body').animate({
scrollTop: $(href).offset().top
}, 'slow');
e.preventDefault();
});
});