Meu botão ''Voltar ao Topo'' não funciona.

No blog onde quero instalar ele não funcona,porém,em outro blog sim (perfeitamente).Não sei se é algum conflito.Tentei de todas as formas acabar,mas não deu certo.

O código original é esse:

#toTop {
display:none;
text-decoration:none;
position:fixed;
bottom:10px;
right:10px;
overflow:hidden;
width:51px;
height:51px;
border:none;
text-indent:-999px;
background:url([http://3.bp.blogspot.com/-ZaFk139_d7Q/ThWy56hQTtI/AAAAAAAAEtc/i7lYDE7NQRY/s1600/ui.totop.png](http://3.bp.blogspot.com/-ZaFk139_d7Q/ThWy56hQTtI/AAAAAAAAEtc/i7lYDE7NQRY/s1600/ui.totop.png)) no-repeat left top;
}
#toTopHover {
background:url([http://3.bp.blogspot.com/-ZaFk139_d7Q/ThWy56hQTtI/AAAAAAAAEtc/i7lYDE7NQRY/s1600/ui.totop.png](http://3.bp.blogspot.com/-ZaFk139_d7Q/ThWy56hQTtI/AAAAAAAAEtc/i7lYDE7NQRY/s1600/ui.totop.png)) no-repeat left -51px;
width:51px;
height:51px;
display:block;
overflow:hidden;
float:left;
opacity: 0;
-moz-opacity: 0;
filter:alpha(opacity=0);
}

#toTop:active, #toTop:focus {

outline:none;
}

]]></b:skin>

<script src='http://code.jquery.com/jquery-1.6.1.min.js' type='text/javascript'/>
<script src='http://suyb.googlecode.com/files/jquery.easing.1.3.js' type='text/javascript'/>
<script src='http://suyb.googlecode.com/files/jquery.ui.totop.js' type='text/javascript'/>
<script type='text/javascript'>
$(document).ready(function() {

/* var defaults = { containerID: 'moccaUItoTop', // fading element id containerHoverClass: 'moccaUIhover', // fading element hover class scrollSpeed: 1200, easingType: 'linear' }; */

$().UItoTop({ easingType: 'easeOutQuart' });

});
</script>

</head>

Qual seria o motivo do problema?