Function animate

jquery.scrollTo.js:155–166

(callback)

			animate(settings.onAfter);

			function animate(callback) {
				var opts = $.extend({}, settings, {
					// The queue setting conflicts with animate()
					// Force it to always be true
					queue: true,
					duration: duration,
					complete: callback && function() {
						callback.call(elem, targ, settings);
					}
				});
				$elem.animate(attr, opts);
			}
		});
	};