Ir arriba con JQuery

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En PH.Creative nos muestran como insertar una etiqueta con JQuery que nos permite, pulsando sobre ella, volver al principio de la pagina.

CSS

#toTop {
width:60px;
background:#111;
border:5px solid #333;
text-align:center;
padding:5px;
position:fixed;
bottom:10px;right:10px;
cursor:pointer;
color:#666;
text-decoration:none;
filter:alpha(opacity=40);
opacity:.40;
-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=40)"; /*--IE 8 Transparency--*/
}

SCRIPT

<script type='text/javascript'>
/*-----------------------
* jQuery Plugin: Scroll to Top
* by Craig Wilson, Ph.Creative (http://www.ph-creative.com)
*
* Copyright (c) 2009 Ph.Creative Ltd.
* Description: Adds an unobtrusive "Scroll to Top" link to your page with smooth scrolling.
* For usage instructions and version updates to go http://blog.ph-creative.com/post/jquery-plugin-scroll-to-top.aspx
*
* Version: 1.0, 12/03/2009
-----------------------*/

$(function(){$.fn.scrollToTop=function(){$(this).hide().removeAttr(&quot;href&quot;);if($(window).scrollTop()!=&quot;0&quot;){$(this).fadeIn(&quot;slow&quot;)}var scrollDiv=$(this);$(window).scroll(function(){if($(window).scrollTop()==&quot;0&quot;){$(scrollDiv).fadeOut(&quot;slow&quot;)}else{$(scrollDiv).fadeIn(&quot;slow&quot;)}});$(this).click(function(){$(&quot;html, body&quot;).animate({scrollTop:0},&quot;slow&quot;)})}});
</script>
<script type='text/javascript'>
$(function() {
$(&quot;#toTop&quot;).scrollToTop();
});
</script>

HTML

<a href='#' id='toTop'>Ir arriba</a>

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