ANTES DE </STYLE>

#scrollToTop:link, #scrollToTop:visited { display: none; position: fixed; top: 20px; right: 20px; } #scrollToTop:hover, #scrollToTop:active {

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ANTES DE </BODY>

<a href="#" id="scrollToTop"><img class="pushbutton4" src="URL DE TU IMAGEN" /></a>

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>

<script src="http://static.tumblr.com/ikeq9mi/DfYl6o46t/scrolltotop.min.js"></script>