gistfile1.js

Scroll = function(end) {
	this.end   = end || 0;
	this.start = this.getStart();
};
Scroll.prototype = {
	getStart: function() {
		return $(window).scrollTop();
	},

	go: function(callback) {
		$().scrollTop(this.end);
		callback();
	},

	animate: function(options) {
		options = $.extend({
			duration: 150
		}, options);
		$('html, body').animate({
			scrollTop: this.end
		}, options);
	},

	back: function() {
		$().scrollTop(this.start);
	}
};