var imyuan;
imyuan || (imyuan = {});

(function(a) {

    a.fn.extend({
        returntop: function() {
            if (this[0]) {
                var b = this.click(function() {
                    a("html, body").animate({
                        scrolltop: 0
                    },
                    120)
                }),
                c = null;
                a(window).bind("scroll",
                function() {
                    var d = a(document).scrolltop(),
                    e = a(window).height();
                    0 < d ? b.css("bottom", "200px") : b.css("bottom", "-200px");
                    a.isie6() && (b.hide(), cleartimeout(c), c = settimeout(function() {
                        b.show();
                        cleartimeout(c)
                    },
                    1e3), b.css("top", d + e - 125))
                })
            }
        }

    })
})

(jquery); (function(a) {

    a("body")('<a class="close" href="javascript:;"></a>');

})

(function() {

    $("#returntop").returntop()
});