simple code for the page to go to top.

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<script src="jquery.toTop.js"></script>
 <script> $.toTop({ css: { border: '1px dotted gray', padding: 5 }, image: 'toTop.png' }); </script>

you need an image toTop.png
change the right paths to image and jquery.toTop.js
change image padding, border
place code in theme templates.

if the jquery presents then delete this line
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>

thats all.