<style type="text/css">
#aposcroll a {
text-decoration:none;
color:red;
}

#aposcroll:hover {
background-color:rgba(200, 200, 200, 0.7);
box-shadow:0px -5px 10px #777;
}
</style>
<div style="padding:30px 5px 0px 5px;position:fixed;top:0px;right:0px;z-index:999;width:70px;height:100%;opacity:0" id="aposcroll"><center><a href="javascript://">^ Вверх</a></center></div>

<script type="text/javascript">
// Кнопка Вверх by Apocalypse
var as = $('#aposcroll');
as.click(function() {
$(document).scrollTo(0, 500);
});
document.onscroll = function() {
var apolst = '0.'+$('body').scrollTop();
if(apolst.length == 5) {
as.stop().fadeTo(500, apolst);
} else if(apolst.length == 4 || apolst.length == 3) {
as.stop().fadeTo(500, 0);
};
};
// apo-ucoz.com (c) 2012
</script>