// 懒人图库 搜集整理 www.lanrentuku.com

$(function() {
	var e = $("#rocket-to-top"),
	t = $(document).scrolltop(),
	n,
	r,
	i = !0;
	$(window).scroll(function() {
		var t = $(document).scrolltop();
		t == 0 ? e.css("background-position") == "0px 0px" ? e.fadeout("slow") : i && (i = !1, $(".level-2").css("opacity", 1), e.delay(100).animate({
			margintop: "-1000px"
		},
		"normal",
		function() {
			e.css({
				"margin-top": "-125px",
				display: "none"
			}),
			i = !0
		})) : e.fadein("slow")
	}),
	e.hover(function() {
		$(".level-2").stop(!0).animate({
			opacity: 1
		})
	},
	function() {
		$(".level-2").stop(!0).animate({
			opacity: 0
		})
	}),
	$(".level-3").click(function() {
		function t() {
			var t = e.css("background-position");
			if (e.css("display") == "none" || i == 0) {
				clearinterval(n),
				e.css("background-position", "0px 0px");
				return
			}
			switch (t){
			case "0px 0px":
				e.css("background-position", "-298px 0px");
				break;
			case "-298px 0px":
				e.css("background-position", "-447px 0px");
				break;
			case "-447px 0px":
				e.css("background-position", "-596px 0px");
				break;
			case "-596px 0px":
				e.css("background-position", "-745px 0px");
				break;
			case "-745px 0px":
				e.css("background-position", "-298px 0px");
			}
		}
		if (!i) return;
		n = setinterval(t, 50),
		$("html,body").animate({scrolltop: 0},"slow");
	});
});