إنشاء زر للأعلى وللأسفل مع الاختفاء لمدونات بلوجر

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<div style='clear:both;'/>  <script type='text/javascript'>//<![CDATA[$(window).scroll(function () {    if ($(this).scrollTop() > 100) {        $("#gotop").removeAttr("href");        $("#gotop").stop().animate({            bottom: "0",            right: "0"        }, {            duration: 800,            queue: false        })    } else {        $("#gotop").stop().animate({            bottom: "-50",            right: "-50"        }, {            duration: 1000,            queue: false        })    }   if ($(this).scrollTop() > 100) {        $("#gobottom").removeAttr("href");        $("#gobottom").stop().animate({            top: "-50",            right: "-50"        }, {            duration: 800,            queue: false        })    } else {        $("#gobottom").stop().animate({            top: "0",            right: "0"        }, {            duration: 1000,            queue: false        })    }
});$(function () {    $("#gotop").click(function () {        $("html, body").animate({            scrollTop: 0        }, "slow");        return false    })    $("#gobottom").click(function () {        $("html, body").animate({            scrollTop: $('#footer').offset().top        }, 970);        return false    })});//]]></script><a id="gotop" style="bottom: -50px; right: -50px;">Lên Trên!</a><a id="gobottom" style="top: 0px; right: 0px;">Xuống Dưới!</a><div id='footer'/>