smoothScroll(1000);
function smoothScroll (duration) {
	$('a[href^="#"]').on('click', function(event) {

		var target = $( $(this).attr('href') );

		if( target.length ) {
			event.preventDefault();
			$('html,body').animate({
				scrollTop: target.offset().top
			}, duration);
		}
	});
}