"

From 2012.igem.org

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()

});