vào vấn đề luôn
Demo :

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Codes
Chèn vào footer_end

Code:

<a style="display: inline;" id="top-link" href="#top">Top of Page</a>

Chèn codes này vào css :

Code:

#top-link {
    background: url("http://www.jayvietnam.com/styles/inkd/yo.png") no-repeat scroll left top transparent;
    border: medium none;
    bottom: 10px;
    display: none;
    height: 125px;
    overflow: hidden;
    position: fixed;
    right: 10px;
    text-decoration: none;
    text-indent: -999px;
    width: 66px;
}

Xog . okey