Centering floated items

gistfile1.css

/* http://hail2u.net/blog/webdesign/centering-floated-list.html */
.centered {
    position: relative;
    overflow: hidden;
}
.centered ul {
    position: relative;
    left: 50%;
    float: left;
}
.centered ul li {
    position: relative;
    left: -50%;
    float: left;
}