<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>

<style>
/* 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: white url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiCHD_UFyWnlqZr4rv8k187e50H12Q-dP-LSzpY0mU1D5hvAu5b9kFvEDh4BcPsnX81GN8PHBurtIz3gpp5OdDCCKgAtyr0oV4rHUML2ulsgfORxpK6aqrFdCo69O8K4jP5HbmtMfcdL5w/s16/arrow_up.png ) no-repeat top left;
background-position:50% 50%;
width:20px; /* Button&#39;s width */
height:20px; /* Button&#39;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/AVvXsEghulKy3bnq7BJBkIEYyG21FRxh0YZXFzqhs-0bd1l0_RFjWqpe1IfZVV24czBPzPcYp7IVYfrOAw2YhxA1L7lQl6M6Lm-5xC1vUMiIBgyxEEZRTRZBu96qw4q7RZa6w3dRMRXzj4QCHaY/s16/arrow_down.png ) no-repeat top left;
background-position:50% 50%;
width:20px; /* Button&#39;s width */
height:20px; /* Button&#39;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);
}
</style>