jquery combined with css to simply achieve the return to top effect_jquery

.backToTop {
display: none;
width: 18px;
line-height: 1.2;
padding: 5px 0;
background-color: #000;
color: #fff;
font-size: 12px ;
text-align: center;
position: fixed;
_position: absolute;
right: 10px;
bottom: 100px;
_bottom: "auto";
cursor: pointer;
opacity: .6;
filter: Alpha(opacity=60);
}

(function() {
var $backToTopTxt = "Return to top", $backToTopEle = $(' ').appendTo($("body"))
.text($backToTopTxt).attr("title", $backToTopTxt).click(function () {
$("html, body").animate({ scrollTop: 0 }, 120);
}), $backToTopFun = function() {
var st = $(document). scrollTop(), winh = $(window).height();
(st > 0)? $backToTopEle.show(): $backToTopEle.hide();
//Positioning under IE6
if (!window.XMLHttpRequest) {
$backToTopEle.css("top", st winh - 166);
}
};
$(window).bind("scroll", $backToTopFun);
$(function() { $backToTopFun(); }); })();: