I have a better idea than the previous way is to change the link text into an image that serves as a key to scrol to the top of the page.
There are many options that picture you can choose. please choose your own.
Add the following code to the web pages you <body>


<a href='#' style='display:scroll;position:fixed;bottom:5px;right:5px;' title='Back to Top'><img src='http://2.bp.blogspot.com/_vJyBmxm3NVk/S0kUcV9ZkUI/AAAAAAAAAZc/38uz_wn46fs/s320/Backtotopblack.png'/></a>

<a href='#' style='display:scroll;position:fixed;bottom:5px;right:5px;' title='Back to Top'><img src='http://2.bp.blogspot.com/_vJyBmxm3NVk/S0kUp_hLySI/AAAAAAAAAZk/u8VbS2vFN2c/s320/Backtotopred.png'/></a>

<a href='#' style='display:scroll;position:fixed;bottom:5px;right:5px;' title='Back to Top'><img src='http://1.bp.blogspot.com/_vJyBmxm3NVk/S0kURlQXdzI/AAAAAAAAAZM/i1-x3WdutCQ/s320/Backtotopblue.png'/></a>

<a href='#' style='display:scroll;position:fixed;bottom:5px;right:5px;' title='Back to Top'><img src='http://2.bp.blogspot.com/_vJyBmxm3NVk/S0kUUeRRurI/AAAAAAAAAZU/Nqyv_95vxvo/s320/Backtotopgreen.png'/></a>

<a href='#' style='display:scroll;position:fixed;bottom:5px;right:5px;' title='Back to Top'><img src='http://3.bp.blogspot.com/_vJyBmxm3NVk/S0kUrRhGwLI/AAAAAAAAAZs/gXx6reQcxEU/s320/Backtotopyellow.png'/></a>

<a href='#' style='display:scroll;position:fixed;bottom:5px;right:5px;' title='Back to Top'><img src='http://3.bp.blogspot.com/_vJyBmxm3NVk/S0kUudYCVyI/AAAAAAAAAZ0/u31B75hzoiU/s320/Backtotoppurple.png'/></a>

<a href='#' style='display:scroll;position:fixed;bottom:5px;right:5px;' title='Back to Top'><img src='http://1.bp.blogspot.com/_vJyBmxm3NVk/S0kUv3bGj6I/AAAAAAAAAZ8/kEr9lsiUQmc/s320/Backtotoporange.png'/></a>

<a href='#' style='display:scroll;position:fixed;bottom:5px;right:5px;' title='Back to Top'><img src='http://3.bp.blogspot.com/_vJyBmxm3NVk/S0kUxV7WGUI/AAAAAAAAAaE/V6ovL3i0-sE/s320/Backtotoppink.png'/></a>
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