Botões de Top e Bottom

Retirado de: http://helplogger.blogspot.com.br/2013/03/how-to-add-go-to-top-and-go-to-bottom.html

Botões com jQuery slide effect

Passo 1. ACIMA de:

 ]]></b:skin>

cole o seguinte código:

 /* Up and Down Buttons with jQuery
----------------------------------------------- */
.button_up{
padding:7px; /* Distance between the border and the icon */
background-color:white;
border:1px solid #CCC; /* Border Color */
position:fixed;
background: whiteurl(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi4p8QhyphenhyphenSnR86jq8-ykzttwb7qK_vq0NVoSnPw9iDSdA3v_hs2tWu44pF_D9F7VErlMokmiTXHuBjT57p28jeFaqdzA2a7WIh8fg0OmMQ66Ym-ZnXzXWfxmU_JnaHqCi-jg7HHVftSSt8Q/s16/arrow_up.png) no-repeat top left;
background-position:50% 50%;
width:20px; /* Button's width */
height:20px; /* Button's height */
bottom:280px; /* Distance from the bottom */
right:5px; /* Change right to left if you want the buttons on the left */
white-space:nowrap;
cursor: pointer;
border-radius: 3px 3px 3px 3px;
opacity:0.7;
filter:progid:DXImageTransform.Microsoft.Alpha(opacity=70);
}
.button_down{
padding:7px; /* Distance between the border and the icon */
background-color:white;
border:1px solid #CCC; /* Border Color */
position:fixed;
background: white url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEilhYcdpgelNqk6R3mROUlucvWeP-jEcikM3j_of9f-kbVRr9tGIueHH9uXtwRJPm_RwmpbJ1TTb9WSZHIKQkEMNQ1jA1u1bO7ivGxys6uyfct5107bleXnpEF3wYBSnCGvCFYhATGbF7Y/s16/arrow_down.png) no-repeat top left;
background-position:50% 50%;
width:20px; /* Button's width */
height:20px; /* Button's height */
bottom:242px; /* Distance from the bottom */
right:5px; /* Change right to left if you want the buttons on the left */
white-space:nowrap;
cursor: pointer;
border-radius: 3px 3px 3px 3px;
opacity:0.7;
filter:progid:DXImageTransform.Microsoft.Alpha(opacity=70);
}

Note:  - partes em verde podem ser alteradas para customização.
           - Altere as setas trocando as URLs em azul.
           - Mudar a cor do background dos botões: altere o white  

Passo 2. ACIMA de:

 </body>

cole o seguinte código:

 <script src='http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js' type='text/javascript'/>

<div class='button_up' id='button_up' style='display:none;'/>
<div class='button_down' id='button_down' style='display:none;'/>

<script>
//<![CDATA[
(function(){var special=jQuery.event.special,uid1='D'+(+new Date()),uid2='D'+(+new Date()+1);special.scrollstart={setup:function(){var timer,handler=function(evt){var _self=this,_args=arguments;if(timer){clearTimeout(timer)}else{evt.type='scrollstart';jQuery.event.handle.apply(_self,_args)}timer=setTimeout(function(){timer=null},special.scrollstop.latency)};jQuery(this).bind('scroll',handler).data(uid1,handler)},teardown:function(){jQuery(this).unbind('scroll',jQuery(this).data(uid1))}};special.scrollstop={latency:300,setup:function(){var timer,handler=function(evt){var _self=this,_args=arguments;if(timer){clearTimeout(timer)}timer=setTimeout(function(){timer=null;evt.type='scrollstop';jQuery.event.handle.apply(_self,_args)},special.scrollstop.latency)};jQuery(this).bind('scroll',handler).data(uid2,handler)},teardown:function(){jQuery(this).unbind('scroll',jQuery(this).data(uid2))}}})();

$(function() {
var $elem = $('body');
$('#button_up').fadeIn('slow');
$('#button_down').fadeIn('slow');
$(window).bind('scrollstart', function(){
$('#button_up,#button_down').stop().animate({'opacity':'0.2'});
});
$(window).bind('scrollstop', function(){
$('#button_up,#button_down').stop().animate({'opacity':'1'});
});
$('#button_down').click(
function (e) {
$('html, body').animate({scrollTop: $elem.height()}, 800);
} );
$('#button_up').click(
function (e) {
$('html, body').animate({scrollTop: '0px'}, 800);
} );});
//]]>
</script>

Obs.: Para remover "Go to top" button, apague o primeiro código em negrito. Para remover o "Go to bottom", apague o segundo.