Scroll smoothly to #hash

gistfile1.txt

		$('nav a[href^="#"]').on('click',function (e) {
			e.preventDefault();

			var target = this.hash,
			$target = $(target);

			var distanceBetween = $target.offset().top - $(document).scrollTop();
			var animationLength = Math.abs(distanceBetween * 0.25);

			$('html, body').stop().animate({
				'scrollTop': $target.offset().top
			}, animationLength, 'swing', function () {
				window.location.hash = target;
			});
		});