主流瀏覽器對 Jquery scrollTop 支持

 var doc;
        if ($.browser.msie || $.browser.opera || $.browser.mozilla) {
            doc = "html";
        } else {
            if ($.browser.safari || $.browser.chrome) {
                doc = "body";
            }
        }
        $(ele).bind("click",function(){
            $(doc).animate(
                {
                    "scrollTop":0
                },
                {
                    duration:300,
                    complete:function(){},
                    easing:"easeOutCirc"
                });
        })